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A Monochromatic light of frequency is produced by a laser. The power emitted is . The number of photons emitted on the average by the source per second is,
(a)
(b)
(c)
(d)

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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 . The wavelength of the incident radiation, for which the stopping potential is , lies in the

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The number of photoelectrons emitted for the light of a frequency (higher than the threshold frequency ) is proportional to:-

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A monochromatic light of wavelength is produced by helium-neon laser. The power emitted is . 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 is producing, photons per second of wavelength . Another source is producing photons per second of wavelength then , 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 , when ultraviolet light of falls on it, must be

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The electron in the hydrogen atom jumps from excited state to its ground state and the photons thus emitted irradiate a photosensitive material. If the work function of the material is , the stopping potential is estimated to be,
(Energy of the electron in )

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