In a Laser (say neon laser) all the atoms emit the light waves of (1) Same frequency (2) Same amplitude (3) Same phase (4) All of the above

In a Laser (say neon laser) all the atoms emit the light waves of (1) Same frequency (2) Same amplitude (3) Same phase (4) All of the above
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All of the above
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In a Laser (say neon laser) all the atoms emit the light waves of – (1) Same frequency (2) Same amplitude (3) Same phase (4) All of the above

Description : In a Laser (say neon laser) all the atoms emit the light waves of – (1) Same frequency (2) Same amplitude (3) Same phase (4) All of the above

Last Answer : (4) All of the above Explanation: In a Laser all the atoms emit the light waves of same frequency, amplitude and phase. A laser is a device that emits light (electromagnetic radiation) ... photons. The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation.

Standing waves are formed when two sets of waves of equal amplitude and frequency w) are in phase x) are in opposite phase y) move through each other in opposite directions z) are reflected from the same surface

Description : Standing waves are formed when two sets of waves of equal amplitude and frequency w) are in phase x) are in opposite phase y) move through each other in opposite directions z) are reflected from the same surface

Last Answer : ANSWER: Y -- MOVE THROUGH EACH OTHER IN OPPOSITE DIRECTIONS 

Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit (1) X-rays (2) ultraviolet light (3) (4) All of the above (4) radio waves

Description : Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit (1) X-rays (2) ultraviolet light (3) (4) All of the above (4) radio waves

Last Answer : (4) All of the above Explanation: A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Infrared LEDs are used in remote-control circuits, such as those used with a wide variety of consumer electronics.

What is the wavelength of red light emitted by a helium-neon laser? w) 122 nanometers x) 633 nanometers y) 2.43 picometers z) 1.37 micrometers

Description : What is the wavelength of red light emitted by a helium-neon laser? w) 122 nanometers x) 633 nanometers y) 2.43 picometers z) 1.37 micrometers

Last Answer : ANSWER: X -- 633 NANOMETERS (actually 632.8 nm)

Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is : (1) 1.0 (2) 1.2 (3) 1.5 (4) 2.0

Description : Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is : (1) 1.0 (2) 1.2 (3) 1.5 (4) 2.0

Last Answer : (1) 1.0 Explanation: Since the amplitudes, frequency and the speed of both the waves are in same, hence the wavelength of the composite wave will be the same as the single wave.

If viewed on an oscilloscope, the loudness of a sound wave would be associated with the wave's: w) frequency x) wavelength y) velocity z) amplitude

Description : If viewed on an oscilloscope, the loudness of a sound wave would be associated with the wave's: w) frequency x) wavelength y) velocity z) amplitude

Last Answer : ANSWER: Z -- AMPLITUDE

Which of the answers listed below best completes the statement: The rate at which any part of a wave travels from one place to another determines the wave's: w) propagation velocity x) period y) amplitude z) frequency

Description : Which of the answers listed below best completes the statement: The rate at which any part of a wave travels from one place to another determines the wave's: w) propagation velocity x) period y) amplitude z) frequency

Last Answer : ANSWER: W -- PROPAGATION VELOCITY

Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is : (1) 1.0 (2) 1.2 (3) 1.5 (4) 2.0

Description : Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is : (1) 1.0 (2) 1.2 (3) 1.5 (4) 2.0

Last Answer : 2mm

In the formation of stationary waves, at T⁄2 the waves are A. out of phase B. in phase C. diminished D. twice the amplitude

Description : In the formation of stationary waves, at T⁄2 the waves are A. out of phase B. in phase C. diminished D. twice the amplitude

Last Answer : . in phase

What do radioactive substances emit? (1) Radio waves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ rays

Description : What do radioactive substances emit? (1) Radio waves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ rays

Last Answer : (4) α, β and γ rays Explanation: Of the three main types of radiation given off during radioactive decay, two are particles and one is energy; scientists call them alpha, beta and gamma after the first three letters of the Greek alphabet.

________ generates light beam at a specific visible frequency. A. Glass fiber B. Infrared C. Light waves D. Laser

Description : ________ generates light beam at a specific visible frequency. A. Glass fiber B. Infrared C. Light waves D. Laser

Last Answer : D. Laser

Amplitude of modulated wave is in phase with A. output B. system C. frequency D. signal

Description : Amplitude of modulated wave is in phase with A. output B. system C. frequency D. signal

Last Answer : signal

Which light emitter is preferred for high-speed data in a fiber-optic system? ∙ A. incandescent ∙ B. LED ∙ C. neon ∙ D. laser

Description : Which light emitter is preferred for high-speed data in a fiber-optic system? ∙ A. incandescent ∙ B. LED ∙ C. neon ∙ D. laser

Last Answer : D. laser

Which light emitter is preferred for high speed data in a fiber-optic system ∙ a. Incandescent ∙ b. LED ∙ c. Neon ∙ d. Laser

Description : Which light emitter is preferred for high speed data in a fiber-optic system ∙ a. Incandescent ∙ b. LED ∙ c. Neon ∙ d. Laser

Last Answer : ∙ d. Laser

Two sources of light are said to be coherent if __________. A. they produce waves of the same wave length B. they have the same amplitude of vibration C. they produce waves in the medium simultaneously D. they produce waves of the same amplitude

Description : Two sources of light are said to be coherent if __________. A. they produce waves of the same wave length B. they have the same amplitude of vibration C. they produce waves in the medium simultaneously D. they produce waves of the same amplitude

Last Answer : D. they produce waves of the same amplitude

When a light wave is reflected from a mirror, there is a change in its – (1) frequency (2) amplitude (3) wavelength (4) velocity

Description : When a light wave is reflected from a mirror, there is a change in its – (1) frequency (2) amplitude (3) wavelength (4) velocity

Last Answer : (2) amplitude Explanation: When a light wave is reflected from an object, it changes not only its amplitude but also its phase according to the properties of the object at a particular point. The velocity and momentum are just reversed in another direction.

What is colour of light related to? (1) Amplitude (2) Frequency (3) Quality (4) Velocity

Description : What is colour of light related to? (1) Amplitude (2) Frequency (3) Quality (4) Velocity

Last Answer : (1) Amplitude Explanation: Colour or colour is the visual perceptual property corresponding in humans to the categories called red, green, blue, and others. Colour derives from the spectrum ... power versus wavelength) interacting in the eye with the spectral sensitivities of the light receptors.

When a light wave is reflected from a mirror, there is a change in its (1) frequency (2) amplitude (3) wavelength (4) velocity

Description : When a light wave is reflected from a mirror, there is a change in its (1) frequency (2) amplitude (3) wavelength (4) velocity

Last Answer : amplitude

What is colour of light related to ? (1) Amplitude (2) Frequency (3) Quality (4) Velocity

Description : What is colour of light related to ? (1) Amplitude (2) Frequency (3) Quality (4) Velocity

Last Answer : Amplitude

What is it called when bats, whales, and dolphins emit sound waves and interpret the reflect sound waves as a means to locate objects?

Description : What is it called when bats, whales, and dolphins emit sound waves and interpret the reflect sound waves as a means to locate objects?

Last Answer : Sonar is a system that locates objects by transmitting sound waves and detecting the waves when they are reflected off of objects. Bats and many other animals, such as whales and dolphins, use natural sonar to navigate and capture

Radioactive elements emit – (1) Radiowaves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ radiations

Description : Radioactive elements emit – (1) Radiowaves (2) Infrared waves (3) Ultraviolet waves (4) α, β and γ radiations

Last Answer : (4) α, β and γ radiations Explanation: The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called ... the radioactive substances are separated in to three types, called a, b and g rays.

Sodium vapour lamps glow with yellow colour. This is due to - (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Description : Sodium vapour lamps glow with yellow colour. This is due to - (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the ... (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Last Answer : (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum Explanation: Sodium Vapour Lamps glow with yellow colour due to the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum.

Sodium vapour lamps glow with yellow colour. This is due to (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Description : Sodium vapour lamps glow with yellow colour. This is due to (1) sublimation of sodium to emit yellow colour (2) the emission of excess energy absorbed by sodium atoms, in the yellow region of the ... (3) the low ionisation energy of sodium (4) its ability to absorb all other colours except yellow

Last Answer : the emission of excess energy absorbed by sodium atoms, in the yellow region of the spectrum

Do light bulbs emit an electrical current?

Description : Do light bulbs emit an electrical current?

Last Answer : They don’t emit anything. they use power, not create it. The different wattages match up to the sockets you have.

Can radio antennas emit visible light? -Physics

Description : Can radio antennas emit visible light? -Physics

Last Answer : Yes, radio antennas can emit visible light, but probably not in the way that you're thinking. If you pump enough energy into a radio antenna, you can heat it up until it glows and emits ... are other devices that can transmit information using visible light, the most practical of which is the laser.

The characteristic that distinguishes a laser beam from an ordinary light beam is: w) the greater frequency of the laser beam x) the coherence of the laser beam y) the color of the laser beam z) the greater polarization of the laser beam

Description : The characteristic that distinguishes a laser beam from an ordinary light beam is: w) the greater frequency of the laser beam x) the coherence of the laser beam y) the color of the laser beam z) the greater polarization of the laser beam

Last Answer : ANSWER: X -- THE COHERENCE OF THE LASER BEAM

Which type of laser is the simplest to modulate directly by changing its excitation? a. Semiconductor b. Ruby c. Helium-neon d. Neodymium-YAG

Description : Which type of laser is the simplest to modulate directly by changing its excitation? a. Semiconductor b. Ruby c. Helium-neon d. Neodymium-YAG

Last Answer : a. Semiconductor

Which type of laser is the simplest to modulate directly by changing its excitation? a. Semiconductor b. Ruby c. Helium-neon d. Neodymium-YAG

Description : Which type of laser is the simplest to modulate directly by changing its excitation? a. Semiconductor b. Ruby c. Helium-neon d. Neodymium-YAG

Last Answer : a. Semiconductor

Which type of laser is the simplest to modulate directly by changing its excitation? ∙ a. Semiconductor ∙ b. Ruby ∙ c. Helium-neon ∙ d. Neodymium-YAG

Description : Which type of laser is the simplest to modulate directly by changing its excitation? ∙ a. Semiconductor ∙ b. Ruby ∙ c. Helium-neon ∙ d. Neodymium-YAG

Last Answer : a. Semiconductor

Which type of laser is the simplest to modulate directly by changing its excitation? ∙ a. Semiconductor ∙ b. Ruby ∙ c. Helium-neon ∙ d. Neodymium-YAG

Description : Which type of laser is the simplest to modulate directly by changing its excitation? ∙ a. Semiconductor ∙ b. Ruby ∙ c. Helium-neon ∙ d. Neodymium-YAG

Last Answer : Semiconductor

In Helium-neon Laser discharge tube, neon gas is a) 85% b) 15% c) 75% d) 45%

Description : In Helium-neon Laser discharge tube, neon gas is a) 85% b) 15% c) 75% d) 45%

Last Answer : b) 15%

In Helium-neon Laser, in meta stable state, helium is located at the energy level: a) 20.66 eV b) 20.77 eV c) 20.61 eV d) 20.71 eV

Description : In Helium-neon Laser, in meta stable state, helium is located at the energy level: a) 20.66 eV b) 20.77 eV c) 20.61 eV d) 20.71 eV

Last Answer : c) 20.61 eV

In Helium-neon Laser discharge tube, helium gas is a) 15% b) 85% c) 75% d) 35%

Description : In Helium-neon Laser discharge tube, helium gas is a) 15% b) 85% c) 75% d) 35%

Last Answer : b) 85%

Common type of Laser used in physics laboratories is a) hydrogen neon Laser b) helium-neon Laser c) carbon neon Laser d) argon neon laser

Description : Common type of Laser used in physics laboratories is a) hydrogen neon Laser b) helium-neon Laser c) carbon neon Laser d) argon neon laser

Last Answer : b) helium-neon Laser

What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

Description : What type of transmission is radiated from an aircraft’s radio altimeter antenna? A. An amplitude modulated continuous wave B. A pulse position modulated UHF signal C. A differential phase shift keyed UHF signal D. A frequency modulated continuous wave

Last Answer : D. A frequency modulated continuous wave

In_____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude)of the modulating signal. The peak amplitude and phase of the carrier signal remainconstant,but as the amplitudeof the information signal changes, thefrequency of thecarrier changes correspondingly. A) AM B) PM C) FM D) none of the above

Description : In_____ transmission, the frequency of the carrier signal is modulated to follow the changing voltage level (amplitude)of the modulating signal. The peak amplitude and phase of the carrier signal remainconstant,but as ... of thecarrier changes correspondingly. A) AM B) PM C) FM D) none of the above

Last Answer : FM

In________, the phase of thecarrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant. A) ASKB)PSKC)FSKD)QAM

Description : In________, the phase of thecarrier is varied to represent two or more different signal elements. Both peak amplitude and frequency remain constant. A) ASK B) PSK C) FSK D) QAM

Last Answer : PSK

In________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remainconstant. A) ASK B) PSK C) FSK D) QAM

Description : In________, the amplitude of the carrier signal is varied to create signal elements. Both frequency and phase remainconstant. A) ASK B) PSK C) FSK D) QAM

Last Answer : ASK

_______ describes the position of the waveform relative to time 0. A) Frequency B) Phase C) Amplitude D) Voltage

Description : _______ describes the position of the waveform relative to time 0. A) Frequency B) Phase C) Amplitude D) Voltage

Last Answer : Phase

In a time-domain plot, the horizontal axis is a measure of ________. A) signal amplitude B) frequency C) phase D) time

Description : In a time-domain plot, the horizontal axis is a measure of ________. A) signal amplitude B) frequency C) phase D) time

Last Answer : time

In a frequency-domain plot, thehorizontal axis measures the________. A) peak amplitude B) frequency C) phase D) slope

Description : In a frequency-domain plot, thehorizontal axis measures the________. A) peak amplitude B) frequency C) phase D) slope

Last Answer : frequency

Bits can be sent over guided and unguided media as analog signal by ___________ a. digital modulation b. amplitude modulation c. frequency modulation d. phase modulation

Description : Bits can be sent over guided and unguided media as analog signal by ___________ a. digital modulation b. amplitude modulation c. frequency modulation d. phase modulation

Last Answer : a. digital modulation

The absolute value of a signal's highest intensity is called………. A. Peak Amplitude B. Frequency C. Phase D. Both a and c

Description : The absolute value of a signal's highest intensity is called………. A. Peak Amplitude B. Frequency C. Phase D. Both a and c

Last Answer : A. Peak Amplitude

To measure the speed of an approaching car a police officer shines – (1) light waves on it (2) microwaves on it (3) radio waves on it (4) ultra high frequency waves on it

Description : To measure the speed of an approaching car a police officer shines – (1) light waves on it (2) microwaves on it (3) radio waves on it (4) ultra high frequency waves on it

Last Answer : (3) radio waves on it Explanation: Radar, which stands for radio detection and ranging, is a system that uses reflected radio waves to detect objects and measure their distance and speed. For example, police use radar to calculate the speed of cars.

To measure the speed of an approaching car a police officer shines (1) light waves on it (2) microwaves on it (3) radio waves on it (4) ultra high frequency waves on it

Description : To measure the speed of an approaching car a police officer shines (1) light waves on it (2) microwaves on it (3) radio waves on it (4) ultra high frequency waves on it

Last Answer : radio waves on it

Two waves of the same frequency have opposite phase when the phase angle between them is?

Description : Two waves of the same frequency have opposite phase when the phase angle between them is?

Last Answer : Two waves of the same frequency have opposite phase when the phase angle between them is 180°.

Do all points on standing waves vibrate with same amplitude?

Description : Do all points on standing waves vibrate with same amplitude?

Last Answer : Feel Free to Answer

They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser). ∙ A. Theodore Maiman ∙ B. KC Kao and GA Bockham ∙ C. Charles Townes and Arthur Schawlow ∙ D. Kapron, Keck and Maurer

Description : They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser). ∙ A. Theodore Maiman ∙ B. KC Kao and GA Bockham ∙ C. Charles Townes and Arthur Schawlow ∙ D. Kapron, Keck and Maurer

Last Answer : C. Charles Townes and Arthur Schawlow

They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser).

Description : They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser).

Last Answer : Charles Townes and Arthur Schawlow