The velocity of heat radiation in vacuum is – (1) Equal to that of light (2) Less than that of light (3) Greater than that of light (4) Equal to that of sound

The velocity of heat radiation in vacuum is – (1) Equal to that of light (2) Less than that of light (3) Greater than that of light (4) Equal to that of sound
by

1 Answer

Answer :

(1) Equal to that of light Explanation: Electrons are generally responsible for heat conduction. The phonons (vibrations of the nuclei) also play a part, depending on the temperature of the medium. It depends on the specific conductor you're using. At some point, in a vacuum, the electrons have to be excited enough to spit out photons, which are Electromagnetic radiation, which in a vacuum should go on forever at the speed of light theoretically.
by
selected

Related questions

The velocity of heat radiation in vacuum is (1) Equal to that of light (2) Less than that of light (3) Greater than that of light (4) Equal to that of sound

Description : The velocity of heat radiation in vacuum is (1) Equal to that of light (2) Less than that of light (3) Greater than that of light (4) Equal to that of sound

Last Answer : Equal to that of light

Pick out the wrong statement. (A) Heat transfer by radiation cannot occur across an absolute volume (B) In case of a shell and tube heat exchanger, the pressure drop through the shell is proportional to the number of times the fluid crosses the bundle between baffles (C) Propagation velocity for travel of heat radiation through vacuum is equal to the velocity of the light (D) The amount of heat involved in the condensation or vaporisation of 1 kg of a fluid is the same

Description : Pick out the wrong statement. (A) Heat transfer by radiation cannot occur across an absolute volume (B) In case of a shell and tube heat exchanger, the pressure drop through the shell is ... The amount of heat involved in the condensation or vaporisation of 1 kg of a fluid is the same

Last Answer : (A) Heat transfer by radiation cannot occur across an absolute volume

Which waves cannot be transmitted through vacuum - (1) Light (2) Heat (3) Sound (4) Electromagnetic

Description : Which waves cannot be transmitted through vacuum - (1) Light (2) Heat (3) Sound (4) Electromagnetic

Last Answer : (3) Sound Explanation: Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.

These waves cannot be trans-mitted through vacuum – (1) Light (2) Sound (3) Heat (4) Electromagnetic

Description : These waves cannot be trans-mitted through vacuum – (1) Light (2) Sound (3) Heat (4) Electromagnetic

Last Answer : (2) Sound Explanation: Sound is a mechanical wave that is created by vibrating objects and propagated through a medium from one location to another. Because mechanical waves rely on particle interaction ... space that are void of particles. That is, mechanical waves cannot travel through a vacuum.

These waves cannot be transmitted through vacuum (1) Light (2) Sound (3) Heat (4) Electromagnetic

Description : These waves cannot be transmitted through vacuum (1) Light (2) Sound (3) Heat (4) Electromagnetic

Last Answer : Sound

Velocity of the sound is minimum in - (1) Steel (2) Vacuum (3) Water (4) Air

Description : Velocity of the sound is minimum in - (1) Steel (2) Vacuum (3) Water (4) Air

Last Answer : (2) Vacuum Explanation: The speed of sound in a vacuum is zero meters per second, as sound cannot travel in a vacuum. Sound is a wave, which means it spreads through the vibration of particles in a medium, such as water or air.

Supersonic plane fly with the speed - (1) less than the speed of sound (2) of sound (3) greater than the speed of sound (4) of light

Description : Supersonic plane fly with the speed - (1) less than the speed of sound (2) of sound (3) greater than the speed of sound (4) of light

Last Answer : (3) greater than the speed of sound Explanation: The regimes of flight are subsonic, transonic, supersonic and hypersonic. Vehicles that fly at supersonic speeds are flying faster than the speed of sound. The speed of sound is about 768 miles per hour (1,236 kilometers per hour) at sea level.

Supersonic plane fly with the speed - (1) less than the speed of sound (2) of sound (3) greater than the speed of sound (4) of light

Description : Supersonic plane fly with the speed - (1) less than the speed of sound (2) of sound (3) greater than the speed of sound (4) of light

Last Answer : (3) greater than the speed of sound Explanation: Supersonic travel is a rate of travel of an object that exceeds the speed of sound (Mach 1). For objects traveling in dry air of a temperature of 20 °C (68 °F) ... this speed is approximately 344 m/s, 1,125 ft/s, 768 mph, 667 knots, or 1,235 km/h.

The velocity of light in vacuum is : (1) 3 * 108 ms-1 (2) 2 * 108 ms-1 (3) 3 * 107 ms-1 (4) 3 * 106 ms-1

Description : The velocity of light in vacuum is : (1) 3 * 108 ms-1 (2) 2 * 108 ms-1 (3) 3 * 107 ms-1 (4) 3 * 106 ms-1

Last Answer : (1) 3 * 108 ms-1 Explanation: The speed of light in a vacuum is 186,282 miles per second that corresponds to about 3 * 108 ms-1.

An index of refraction less than one for a medium would imply A. That the speed of light in the medium is the same as the speed of light in vacuum B. That the speed of light in the medium is greater than the speed of light in vacuum C. Refraction is not possible D. Reflection is not possible

Description : An index of refraction less than one for a medium would imply A. That the speed of light in the medium is the same as the speed of light in vacuum B. That the speed of light in the ... greater than the speed of light in vacuum C. Refraction is not possible D. Reflection is not possible

Last Answer : B. That the speed of light in the medium is greater than the speed of light in vacuum

Sound and light waves both _______. (1) have similar wavelength (2) obey the laws of reflection (3) travel as longitudinal waves (4) travel through vacuum

Description : Sound and light waves both _______. (1) have similar wavelength (2) obey the laws of reflection (3) travel as longitudinal waves (4) travel through vacuum

Last Answer : (2) obey the laws of reflection Explanation: The two laws of reflection of light are applicable to sound waves as well. The incident wave, the normal to the reflecting surface and the reflected wave at the point of incidence lie in the same plane.

At same temperatures, the radiation emitted by all real surfaces is ______ the radiation emitted by a black body.  A. Less than  B. Greater than  C. Equal to  D. Either less than or greater than

Description : At same temperatures, the radiation emitted by all real surfaces is ______ the radiation emitted by a black body.  A. Less than  B. Greater than  C. Equal to  D. Either less than or greater than

Last Answer : Less than

When a fast charged particle traverses a dielectric medium at a velocity exceeding the velocity of light in that medium, radiation is emitted. This radiation is known as: w) point radiation x) Cerenkov radiation y) Synchrotron radiation z) Bremsstrahlung

Description : When a fast charged particle traverses a dielectric medium at a velocity exceeding the velocity of light in that medium, radiation is emitted. This radiation is known as: w) point radiation x) Cerenkov radiation y) Synchrotron radiation z) Bremsstrahlung

Last Answer : ANSWER: X -- CERENKOV RADIATION

By what process is heat transmitted from the filament of an evacuated electric bulb to the glass? (a) Conduction (b) Convection (c) Radiation (d) Heat cannot be transmitted through vacuum

Description : By what process is heat transmitted from the filament of an evacuated electric bulb to the glass? (a) Conduction (b) Convection (c) Radiation (d) Heat cannot be transmitted through vacuum

Last Answer : Ans:(c)

Torricelli's theorem states that the velocity ‘v’ of the liquid emerging from the bottom of the wide tank is given by √(2gh). In practice, this velocity is: A. equal to √(2gh) B. greater than √(2gh) C. lesser than √(2ghD. independent of height and gravitational field strength)

Description : Torricelli's theorem states that the velocity ‘v’ of the liquid emerging from the bottom of the wide tank is given by √(2gh). In practice, this velocity is: A. equal to √(2gh) B. greater than √(2gh) C. lesser than √(2gh) D. independent of height and gravitational field strength

Last Answer :  lesser than √(2gh

When light is traveling through a vacuum, what is the product of the light's wavelength and frequency equal to? w) speed of light x) Plank's constant y) momentum z) wave number

Description : When light is traveling through a vacuum, what is the product of the light's wavelength and frequency equal to? w) speed of light x) Plank's constant y) momentum z) wave number

Last Answer : ANSWER: W -- SPEED OF LIGHT

A small hole in a sheet of aluminum foil is used to diffract yellow light both under water and in a vacuum. Which is true? w) light diffracts less in the water because its wavelength is larger. x) light diffracts less in the water because its wavelength is smaller. y) light diffracts more in the water because its wavelength is larger. z) light diffracts more in the water because its wavelength is smaller.

Description : A small hole in a sheet of aluminum foil is used to diffract yellow light both under water and in a vacuum. Which is true? w) light diffracts less in the water because its wavelength is ... because its wavelength is larger. z) light diffracts more in the water because its wavelength is smaller.

Last Answer : ANSWER: X -- LIGHT DIFFRACTS LESS IN THE WATER BECAUSE ITS WAVELENGTH IS SMALLER

In actual machines a.Mechanical advantage is unity b.Mechanical advantage is greater than velocity ratio c.Mechanical advantage is less than velocity ratio d.Mechanical advantage is less than unity e.Mechanical advantage is equal to velocity ratio

Description : In actual machines a.Mechanical advantage is unity b.Mechanical advantage is greater than velocity ratio c.Mechanical advantage is less than velocity ratio d.Mechanical advantage is less than unity e.Mechanical advantage is equal to velocity ratio

Last Answer : c. Mechanical advantage is less than velocity ratio

In actual machines (A) Mechanical advantage is greater than velocity ratio (B) Mechanical advantage is equal to velocity ratio (C) Mechanical advantage is less than velocity ratio (D) Mechanical advantage is unity

Description : In actual machines (A) Mechanical advantage is greater than velocity ratio (B) Mechanical advantage is equal to velocity ratio (C) Mechanical advantage is less than velocity ratio (D) Mechanical advantage is unity

Last Answer : (C) Mechanical advantage is less than velocity ratio

In ideal machines (A) Mechanical advantage is greater than velocity ratio (B) Mechanical advantage is equal to velocity ratio (C) Mechanical advantage is less than velocity ratio (D) Mechanical advantage is unity

Description : In ideal machines (A) Mechanical advantage is greater than velocity ratio (B) Mechanical advantage is equal to velocity ratio (C) Mechanical advantage is less than velocity ratio (D) Mechanical advantage is unity

Last Answer : (B) Mechanical advantage is equal to velocity ratio

The velocity of sound in moist air is more than in dry air because the moist air has (1) less density than city air (2) less pressure than dry air (3) more pressure than dry air (4) more density than dry air

Description : The velocity of sound in moist air is more than in dry air because the moist air has (1) less density than city air (2) less pressure than dry air (3) more pressure than dry air (4) more density than dry air

Last Answer : (1) less density than city air Explanation: The density of dry air is more than that of moist air (when moisture is removed from air, its density. increases). The speed of sound in a medium is inversely ... root of its density. Therefore, the speed of sound in moist air is more than that in dry air.

The velocity of sound in moist air is more than in dry air because the moist air has (1) less density than dry air. (2) less pressure than dry air. (3) more pressure than dry air. (4) more density than dry air.

Description : The velocity of sound in moist air is more than in dry air because the moist air has (1) less density than dry air. (2) less pressure than dry air. (3) more pressure than dry air. (4) more density than dry air. 

Last Answer : less density than dry air.

The characteristic invalid for heat radiation is that it travels – (1) in a straight line (2) in all directions (3) with the speed of light (4) heating the medium through which it passes

Description : The characteristic invalid for heat radiation is that it travels – (1) in a straight line (2) in all directions (3) with the speed of light (4) heating the medium through which it passes

Last Answer : (3) with the speed of light Explanation: Heat is a form of energy. An important property of heat is that it flows from a body at higher temperature to another body at lower temperature.

The characteristic invalid for heat radiation is that it travels : (1) in a straight line (2) in all directions (3) with the speed of light (4) heating the medium through which it passes

Description : The characteristic invalid for heat radiation is that it travels : (1) in a straight line (2) in all directions (3) with the speed of light (4) heating the medium through which it passes

Last Answer : with the speed of light

The kinetic energy of a stone falling near the earth's surface through a vacuum increases with the: w) square root of its velocity x) cube root of its velocity y) square of its velocity z) cube of its velocity

Description : The kinetic energy of a stone falling near the earth's surface through a vacuum increases with the: w) square root of its velocity x) cube root of its velocity y) square of its velocity z) cube of its velocity

Last Answer : ANSWER: Y -- SQUARE OF ITS VELOCITY

A supersonic plane flies at the speed (a) Less than the speed of the sound (b) Of sound (c) Greater than the speed of the sound (d) Of light

Description : A supersonic plane flies at the speed (a) Less than the speed of the sound (b) Of sound (c) Greater than the speed of the sound (d) Of light

Last Answer : Ans:(c)

Air over the oceans is colder in summer and warmer in winter compared with air over the continental regions. This is because (a) Water is translucent and has a relatively high heat capacity compared to dirt (b) Compared to dirt, a thicker layer of water participates in the seasonal cycle (c) The albedo of water is greater than that of land and thus reflects more solar radiation (d) Both A and B are true (e) The effect is due to the changes in circulation between continents and oceans

Description : Air over the oceans is colder in summer and warmer in winter compared with air over the continental regions. This is because (a) Water is translucent and has a relatively high heat capacity compared ... B are true (e) The effect is due to the changes in circulation between continents and oceans

Last Answer : (d) Both A and B are true

Mercury is commonly used as a thermometric fluid rather than water because (1) specific heat of mercury is less than water (2) specific heat of mercury is more than water (3) mercury has greater visibility than water (4) density of mercury is more than the water

Description : Mercury is commonly used as a thermometric fluid rather than water because (1) specific heat of mercury is less than water (2) specific heat of mercury is more than water (3) mercury has greater visibility than water (4) density of mercury is more than the water

Last Answer : (3) mercury has greater visibility than water Explanation: One special kind of mercury-inglass thermometer, called a maximum thermometer, works by having a constriction in the neck close to the bulb.

Sound waves can be transmitted by any (1) Medium (2) Vacuum (3) Both medium and vacuum (4) None of the above

Description : Sound waves can be transmitted by any (1) Medium (2) Vacuum (3) Both medium and vacuum (4) None of the above

Last Answer : (1) Medium Explanation: Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. It requires a medium to propagate.

Sound cannot pass through – (1) Water (2) Steel (3) Air (4) Vacuum

Description : Sound cannot pass through – (1) Water (2) Steel (3) Air (4) Vacuum

Last Answer : (4) Vacuum Explanation: Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. Sound ... propagation). Sound cannot travel through a vacuum because it does not provide the medium to propagate.

Among the following materials sound travels fastest in – (1) Steel (2) Air (3) Vacuum (4) Water

Description : Among the following materials sound travels fastest in – (1) Steel (2) Air (3) Vacuum (4) Water

Last Answer : (1) Steel Explanation: The speed of sound is the distance travelled during a unit of time by a sound wave propagating through an elastic medium. In dry air at 20 °C (68 °F), the speed ... varies from substance to substance. Sound travels faster in liquids and non-porous solids than it does in air.

Which of the following does NOT travel in a vacuum? w) radio waves x) gamma rays y) magnetic waves z) sound waves

Description : Which of the following does NOT travel in a vacuum? w) radio waves x) gamma rays y) magnetic waves z) sound waves

Last Answer : ANSWER: Z -- SOUND WAVES

Among the following materials sound travels fastest in (1) Steel (2) Air (3) Vacuum (4) Water

Description : Among the following materials sound travels fastest in (1) Steel (2) Air (3) Vacuum (4) Water

Last Answer : Steel

Sound cannot pass through (1) water (2) steel (3) air (4) vacuum

Description : Sound cannot pass through (1) water (2) steel (3) air (4) vacuum

Last Answer : vacuum

A glass prism has a refracting angle of `60^@`. The angle of minimum deviation is `40^@`. If velocity of light in vacuum is `3 xx 10^8 m//s`. Calculat

Description : A glass prism has a refracting angle of `60^@`. The angle of minimum deviation is `40^@`. If velocity of light in vacuum is `3 xx 10^8 m//s`. Calculat

Last Answer : A glass prism has a refracting angle of `60^@`. The angle of minimum deviation is `40^@`. If ... of light in glass. What is the angle of incidence ?

What is the term for the ratio of actual velocity at which a signal travels through a line to the speed of light in a vacuum? A. Velocity factor B. Characteristic impedance C. Surge impedance D. Standing wave ratio

Description : What is the term for the ratio of actual velocity at which a signal travels through a line to the speed of light in a vacuum? A. Velocity factor B. Characteristic impedance C. Surge impedance D. Standing wave ratio

Last Answer : A. Velocity factor

What is the meaning of the term “velocity factor” of a transmission line? A. The ratio of the characteristic impedance of the line to the terminating impedance B. The index of shielding for coaxial cable. C. The velocity of the wave on the transmission line multiplied by the velocity of light in a vacuum. D. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum.

Description : What is the meaning of the term velocity factor of a transmission line? A. The ratio of the characteristic impedance of the line to the terminating impedance B. The index of shielding for coaxial ... The velocity of the wave on the transmission line divided by the velocity of light in a vacuum.

Last Answer : D. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum.

What is the meaning of the term velocity factor of a transmission line? A. The index of shielding for coaxial cable B. The velocity of the wave on the transmission line multiplied by the velocity of light in vacuum C. The ratio of the characteristic impedance of the line to the terminating impedance D. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum

Description : What is the meaning of the term velocity factor of a transmission line? A. The index of shielding for coaxial cable B. The velocity of the wave on the transmission line multiplied by the velocity of ... The velocity of the wave on the transmission line divided by the velocity of light in a vacuum

Last Answer : D. The velocity of the wave on the transmission line divided by the velocity of light in a vacuum

In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be (A) Less than 45°C (B) More than 45°C (C) Equal to 45°C (D) Initially decreases and remains constant thereafter

Description : In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining ... than 45°C (B) More than 45°C (C) Equal to 45°C (D) Initially decreases and remains constant thereafter

Last Answer : (B) More than 45°C

At terminal velocity the A. air resistance and weight are equal B. air resistance is less than weight C. weight is more than air resistance D. air resistance is more than weight

Description :  At terminal velocity the A. air resistance and weight are equal B. air resistance is less than weight C. weight is more than air resistance D. air resistance is more than weight

Last Answer : air resistance and weight are equal

The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is  A. equal to one  B. less than one  C. greater than one  D. none of these

Description : The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is  A. equal to one  B. less than one  C. greater than one  D. none of these

Last Answer : Answer: C

Pick out the wrong statement. (A) Visible radiation provides the necessary activation energy in photochemical reactions (B) The order and molecularity of a complex reaction may not be the same (C) For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k) (D) Molecularity of the reaction is always a whole number greater than zero

Description : Pick out the wrong statement. (A) Visible radiation provides the necessary activation energy in photochemical reactions (B) The order and molecularity of a complex reaction may not be the same (C) For ... rate constant (k) (D) Molecularity of the reaction is always a whole number greater than zero

Last Answer : (B) The order and molecularity of a complex reaction may not be the same

Critical angle of electromagnetic radiation takes place if (A) Angle of incidence is equal to angle of refraction (B) Angle of incidence is greater than the angle of refraction (C) Angle of incidence is equal to 90° (D) Angle of refraction is equal to 90°

Description : Critical angle of electromagnetic radiation takes place if (A) Angle of incidence is equal to angle of refraction (B) Angle of incidence is greater than the angle of refraction (C) Angle of incidence is equal to 90° (D) Angle of refraction is equal to 90°

Last Answer : Answer: Option D

While ascending a hill, the driver of the vehicle keeps the gear ratio – (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Description : While ascending a hill, the driver of the vehicle keeps the gear ratio – (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Last Answer : (4) either equal to or greater than 1 Explanation: While ascending a hill Gear Ratio should be "Either equal to or greater than 1?. Gear Ratio is the ratio between angular velocity of input gear to the angular velocity of output gear. It prevents the vehicle from stalling.

The magnitude of the quarks' electric charge is: w) zero. x) greater than the electron's charge. y) equal to the electron's charge. z) less than the electron's charge.

Description : The magnitude of the quarks' electric charge is: w) zero. x) greater than the electron's charge. y) equal to the electron's charge. z) less than the electron's charge.

Last Answer : ANSWER: Z -- LESS THAN THE ELECTRON'S CHARGE. 

The relationship between kinetic energy and the potential energy of a swinging pendulum bob is one of the following. Is it: w) kinetic energy is greater than potential energy x) kinetic energy is less than potential energy y) kinetic energy is equal to potential energy z) kinetic energy plus potential energy equals a constant

Description : The relationship between kinetic energy and the potential energy of a swinging pendulum bob is one of the following. Is it: w) kinetic energy is greater than potential energy x) kinetic ... kinetic energy is equal to potential energy z) kinetic energy plus potential energy equals a constant  

Last Answer : ANSWER: Z -- KINETIC ENERGY PLUS POTENTIAL ENERGY EQUALS A CONSTANT 

While ascending a hill, the driver of the vehicle keeps the gear ratio (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Description : While ascending a hill, the driver of the vehicle keeps the gear ratio (1) equal to 1 (2) less than 1 (3) greater than 1 (4) either equal to or greater than 1

Last Answer : either equal to or greater than 1

Light waves are different from sound waves in that 1. Light waves are electromagnetic but sound waves are not 2. Light waves can travel through water but sound waves cannot 3. Light travels with the same speed in all media 4. Light waves produce interference but sound waves do not 5. Light can travel through vacuum but sound cannot Which of the above statements is/are correct? (a) 1 and 5 (b) 2 and 3 (c) 3 and 4 (d) 1 and 4

Description : Light waves are different from sound waves in that 1. Light waves are electromagnetic but sound waves are not 2. Light waves can travel through water but sound waves cannot 3. Light travels with the same speed in all media 4. Light ... /are correct? (a) 1 and 5 (b) 2 and 3 (c) 3 and 4 (d) 1 and 4

Last Answer : Ans:(a)