Description : The photoelectric effect is a demonstration of: w) the wave nature of light x) the particle nature of light y) Compton scattering z) the continuous spectrum of radiation
Last Answer : ANSWER: X -- THE PARTICLE NATURE OF LIGHT
Description : The Doppler Effect predicts that the spectrum of light from a visible body moving AWAY from the Earth will experience a shift in frequency when viewed from Earth. This particular shift is known as the: w) Blue shift x) Neutral shift y) Red shift z) Dirac shift
Last Answer : ANSWER: Y -- RED SHIFT
Description : To develop the correct mathematical description of the distribution of radiated energy of a blackbody with respect to wavelength for a given temperature, Planck found it necessary to assume that the molecular ... units or quanta y) radiant energy in a continuous form z) none of the above.
Last Answer : ANSWER: X -- RADIANT ENERGY IN DISCRETE UNITS OR QUANTA
Description : When a physical property such as charge exists in discrete "packets" rather than in continuous amounts, the property is said to be: w) discontinuous x) abrupt y) quantized z) noncontinuous
Last Answer : ANSWER: Y -- QUANTIZED
Description : Black body radiation spectrum is an example of a) band spectra b) continuous spectra c) discrete spectra d) atomic spectra
Last Answer : b) continuous spectra
Description : Weather satellites transmit cloud cover and temperature-humidity profiles back to Earth using images of which combination of the electromagnetic radiation types? w) infra-red and visible light x) ultraviolet and nuclear magnetic y) ultraviolet and infra-red z) ultraviolet and visible light
Last Answer : ANSWER: W -- INFRA-RED AND VISIBLE LIGHT
Description : A beam of white light is passed through a diffraction grating and the resulting spectrum is allowed to fall on a screen. Which one of the following is the color of light that undergoes the greatest deviation from its original direction. Is it: w) red x) yellow y) blue z) violet
Last Answer : ANSWER: W -- RED
Description : Which of the following colors of visible light has the longest wavelength? Is it: w) violet x) green y) yellow z) red
Last Answer : ANSWER: Z -- RED
Description : If 64Cu emits a beta particle, what would the product be? w) 63Cu x) 64Cu+1 y) 64Cu-1 z) 64Zn
Last Answer : ANSWER: Z -- 64Zn
Description : In changing from an energy state of -1.51 electron-volts to -3.40 electron-volts, an atom emits a photon whose energy is: w) 1.51 electron-volts x) 1.89 electron-volts y) 3.40 electron-volts z) 4.91 electron-volts
Last Answer : ANSWER: X -- 1.89 ELECTRON-VOLTS
Description : When an atomic nucleus emits a beta particle, one of its neutrons disintegrates into one of the following set of particles. Does it disintegrate into: w) a positron and an electron x) a proton, an ... and an antineutrino y) a proton, an electron, and a positron z) a neutrino and an antineutrino
Last Answer : ANSWER: X -- A PROTON, AN ELECTRON AND AN ANTINEUTRINO
Description : Four identical samples of a metal are heated to different temperatures. Based on the colors of their incandescences, which sample is the hottest? The sample that is: w) blue-white x) bright red y) yellow z) orange
Last Answer : ANSWER: W -- BLUE-WHITE
Description : What is a neutron star which a Emits radiation that reaches the earth as radio waves and flashes of visible light?
Last Answer : pulsar
Description : When a warm object is heated up why does the thermal radiation emits change?
Last Answer : Feel Free to Answer
Description : When a warm object is heated up why does the thermal radiation it emits changes?
Description : Of the following, the most energetic form of NON-IONIZING radiation is: w) ultra-violet light x) infra-red light y) radar z) microwaves
Last Answer : ANSWER: W -- ULTRA-VIOLET LIGHT
Description : When white light is passed through a double slit which of the following statements is TRUE: w) Each of the bright bands is dispersed into a spectrum x) Only the central band is dispersed into ... one are dispersed into a spectrum z) Each band has a single color different from its neighboring bands
Last Answer : ANSWER: Y -- ALL THE BRIGHT BANDS EXCEPT THE CENTRAL ONE ARE DISPERSED INTO THE SPECTRUM
Description : Which region of the electro-magnetic spectrum will cause sunburns? w) ultraviolet x) infrared y) visible
Last Answer : ANSWER: W -- ULTRAVIOLET
Description : Every hot object emits – (1) X-rays (2) Visible light (3) Infrared rays (4) Ultraviolet rays
Last Answer : (3) Infrared rays
Description : Every hot object emits _____ (1) X–rays (2) Visible light (3) Infrared rays (4) Ultraviolet rays
Last Answer : Infrared rays
Description : The continuous X-ray spectrum is obtained due to the effect called a) Braking radiation b) Bremsstrahlung c) both a & b d) none of a & b
Last Answer : b) Bremsstrahlung
Description : The region of the electromagnetic spectrum immediately above the frequencies to which the human eye is sensitive is called: w) ir x) ultra-violet y) rf z) gamma ray
Last Answer : ANSWER: X -- ULTRA-VIOLET
Description : The dark lines constituting the absorption spectrum exhibited by sunlight are frequently called: w) Fresnel lines x) Fraunhofer lines y) Fermi lines z) Franklin lines
Last Answer : ANSWER: X -- FRAUNHOFER LINES
Description : A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case, (A) The cooling rate will be the same for the two spheres and hence the ... equal amount of radiation from the surrounding in the beginning (D) Both (B) & (C)
Last Answer : (D) Both (B) & (C)
Description : Which pot of water will boil LAST when all are heated by the same source? w) aluminum pot x) iron pot y) brass pot z) titanium pot
Last Answer : ANSWER: Z -- TITANIUM POT
Description : If a metallic object is heated, its density generally: w) increases x) decreases y) fluctuates randomly z) remains the same
Last Answer : ANSWER: X -- DECREASES
Description : Hydrogen atom electron is excited to n = 4 state , in the spectrum of emitted radiation , number of lines in the ultravoilet and visible regions are r
Last Answer : Hydrogen atom electron is excited to n = 4 state , in the spectrum of emitted radiation , number of lines in the ... 1 , 3 C. 2 , 3 D. 3 , 2
Description : A material that glows when struck by the energetic electrons in a CRT
Last Answer : phosphor
Description : Superconducting materials are being used in the Superconducting Super Collider to: w) cool the particles. x) minimize electrical power consumption. y) maximize the acceleration potentials. z) provide radiation shielding.
Last Answer : ANSWER: X -- MINIMIZE ELECTRICAL POWER CONSUMPTION.
Description : Planck's constant was first introduced in order to obtain a correct theoretical prediction of: w) the distribution of frequencies occurring in black body radiation. x) the energy produced by the transformation of mass into energy. y) the speed of light. z) lifetime of the neutron.
Last Answer : ANSWER: W -- THE DISTRIBUTION OF FREQUENCIES OCCURRING IN BLACK BODY RADIATION
Description : In EXTRA-TERRESTRIAL SPACE, heat is transferred by: w) conduction x) convection y) conduction and convention z) radiation
Last Answer : ANSWER: Z -- RADIATION
Description : When radiation breaks an electron pair bond in a molecule and each fragment of the molecule gets one of the bond electrons, the molecular fragments that are formed are called: w) ions x) free radicals y) stable molecules z) gases
Last Answer : ANSWER: X -- FREE RADICALS
Description : The average annual dose of NATURAL radiation by the average American is about: w) 3 millirems x) 30 millirems y) 300 millirems z) 3,000 millirems
Last Answer : ANSWER: Y -- 300 MILLIREMS
Description : Heat from the sun reaches the Earth by: w) conduction x) convection y) radiation z) none of the above
Last Answer : ANSWER: Y -- RADIATION
Description : A typical microwave oven produces microwave radiation with a wavelength of: w) 3 meters x) 3 x 10-2 meters (read: 3 times 10 to the minus 2 meters) y) 3 x 10 -6 meters (read: 3 times 10 to the minus 6 meters) z) 3 x 10-9 meters (read: 3 times 10 to the minus 9 meters)
Last Answer : ANSWER: X -- 3 x 10-2 METERS
Description : Laser radiation is: w) monochromatic x) directed in a narrow beam y) produced with large power densities z) all of the above
Last Answer : ANSWER: Z -- ALL OF THE ABOVE
Description : Heat is transferred from the sun to the earth primarily by: w) conduction x) convection y) radiation z) condensation
Description : Kinetic energy is energy of: w) position x) radiation y) motion z) formation
Last Answer : ANSWER: Y -- MOTION
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
Description : In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie? (1) Visible (2) Infrared (3) Ultraviolet (4) X-ray
Last Answer : (3) Ultraviolet
Description : In which region of electromagnetic spectrum does the Lyman series of hydrogen atom lie ? (1) Visible (2) Infrared (3) Ultraviolet (4) X-ray
Last Answer : Ultraviolet
Description : How does a microwave oven heat up food even though it emits no thermal radiation? -Physics
Last Answer : A microwave oven does emit thermal radiation to heat up food. Microwave radiation is thermal radiation. For some reason, most sources have a mistaken notion that thermal radiation = infrared radiation ... a broad spectrum of frequencies with a certain shape that depends on the emitter's temperature.
Description : Ten coulombs of charge are placed on a solid copper sphere. Once the charge has come to rest, the ELECTRIC POTENTIAL inside the sphere is found to be: w) zero x) uniform inside the sphere and ... the sphere y) smaller than the electric potential outside the sphere z) varying as one over r squared
Last Answer : ANSWER: X -- UNIFORM INSIDE THE SPHERE AND EQUAL TO THE ELECTRIC POTENTIAL ON THE SURFACE OF THE SPHERE
Description : Ten coulombs of positive charge are placed on an irregularly-shaped, solid piece of copper. Once the charge has stopped moving, the electric field inside the copper is: w) zero x) changes as one ... squared y) becomes smaller as you approach the center z) becomes larger as you approach the center
Last Answer : ANSWER: W -- ZERO
Description : When white light passes through a red plate of glass and then through a green plate of glass which one of the following things occur? w) the light is totally absorbed x) the light that emerges is ... ) the light that emerges lacks only its red and green components z) the light that emerges is green
Last Answer : ANSWER: W -- THE LIGHT IS TOTALLY ABSORBED
Description : Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants? (a) Blue and green (b) Green and red (c) Red and violet (d) Violet and blue
Last Answer : (d) Violet and blue
Description : Which of the following colors is not found in the visible light wave spectrum? ∙ a. Red ∙ b. White ∙ c. Orange ∙ d. Yellow
Last Answer : b. White
Description : A Hybrid Bayesian network contains ___________ a) Both discrete and continuous variables b) Only Discrete variables c) Only Discontinuous variable
Last Answer : a) Both discrete and continuous variables
Description : A Hybrid Bayesian network contains Both discrete and continuous variables Only Discontinuous variable Both Discrete and Discontinuous variable Continous variable only.
Last Answer : Both Discrete and Discontinuous variable
Description : Sun appears red in colour at sun-rise and sunset due to – (1) the fact that sun emits only red colour at that time (2) red light having longer wave length scatters away (3) that sun Comes out of the mountains (4) that all other colours scatter away except red
Last Answer : (4) that all other colours scatter away except red Explanation: According to Rayleigh's law, the intensity of scattered light varies inversely as the fourth power of its wavelength. Sunlight consists of ... have to travel a larger part of the atmosphere because they are very close to the horizon.