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Can we find the mass of a photon by the definition p = mv?
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Is it always true that for two sources of equal intensity, the number of photons emitted in a given time are equal?
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The AC voltage across a resistance can be measured using
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What is the speed of a photon with respect to another photon if (a) the two photons are going in the same direction and (b) they are going in opposite directions?
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Can a photon be deflected by an electric field? Or by a magnetic field?
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A hot body is placed in a closed room maintained at a lower temperature. Is the number of photons in the room increasing?
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Should the energy of a photon be called its kinetic energy or its internal energy?
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In an experiment on photoelectric effect, a photon is incident on an electron from one direction and the photoelectron is emitted almost in the opposite direction. Does this violate the principle of conservation of momentum?
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It is found that yellow light does not eject photoelectrons from a metal. Is it advisable to try with orange light or with green light?
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It is found that photosynthesis starts in certain plants when exposed to sunlight, but it does not start if the plants are exposed only to infrared light. Explain.
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The threshold wavelength of a metal is λ0. Light of wavelength slightly less than λ0 is incident on an insulated plate made of this metal. It is found that photoelectrons are emitted for some time and after that the emission stops. Explain.
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If an electron has a wavelength, does it also have a colour?
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Planck's constant has the same dimensions as
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Two photons of
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Let nr and nb be the number of photons emitted by a red bulb and a blue bulb, respectively, of equal power in a given time.
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A bulb rated 60 W at 220 V is connected across a household supply of alternating voltage of 220 V. Calculate the maximum instantaneous current through the filament.
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The equation E = pc is valid
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The work function of a metal is hv0. Light of frequency v falls on this metal. Photoelectric effect will take place only if
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Light of wavelength λ falls on a metal with work-function hc/λ0. Photoelectric effect will take place only if
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When stopping potential is applied in an experiment on photoelectric effect, no photoelectric is observed. This means that
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