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Monochromatic light of frequency of 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 anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The plate current of the photocell varies as follows:

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The graph is showing the photocurrent with the applied voltage of a photoelectric effect experiment. Then

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If changes to , find energy difference given to the particle

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The wavelength involved in the spectrum of deuterium are slightly different from that of hydrogen spectrum, because

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In Davisson-Germer experiment when electron strikes the -crystal which of the following is produced?

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Electrons with de-Broglie wavelength fall on the target in an X-ray tube. The cut-off wavelength of the emitted X-ray is:

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The anode voltage of photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The maximum kinetic energy of the photoelectrons emitted varies with as

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A photon of wavelength (less than threshold wavelength ) is incident on a metal surface of work function . The de Broglie wavelength of the ejected electron of mass is :
