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A Monochromatic light of frequency 6.0×1014 Hz is produced by a laser. The power emitted is 2×103 W. The number of photons emitted on the average by the source per second is,

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Important Questions on Dual Nature of Matter and Radiation

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The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation, for which the stopping potential is 5 V, lies in the

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The number of photoelectrons emitted for the light of a frequency ν (higher than the threshold frequency ν0) is proportional to:-
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A monochromatic light of wavelength 667 nm is produced by helium-neon laser. The power emitted is 9 mW. The number of photons arriving per second on an average at the target irradiated by this beam is,
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The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

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A source S1 is producing, 1015 photons per second of wavelength 5000 A. Another source S2 is producing 1.02×1015  photons per second of wavelength 5100 A then power of S2power of S1, is equal to
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The potential difference that must be applied to stop the fastest photo-electron emitted by nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be
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The electron in the hydrogen atom jumps from excited state n=3 to its ground state n=1 and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be,

(Energy of the electron in nth state, En=-13.6n2 eV)

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Photoelectric emission occurs only when the incident light has more than a certain minimum :