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Monochromatic light of frequency of 6×1014 Hz is produced by a LASER. The power emitted is 2×10-3 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 anode voltage of a photocell is kept fixed. The wavelength of the light falling on the cathode is gradually changed. The plate current I 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 λ=10-10 m changes to λ'=0.5×10-10 m, find energy difference ΔE given to the particle
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The wavelength involved in the spectrum of deuterium 1 2 D are slightly different from that of hydrogen spectrum, because
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In Davisson-Germer experiment when electron strikes the Ni-crystal which of the following is produced?
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Electrons with de-Broglie wavelength λ 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 (λ) of the light falling on the cathode is gradually changed. The maximum kinetic energy (K.E.) of the photoelectrons emitted varies with λ as
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A photon of wavelength λ (less than threshold wavelength λ0 ) is incident on a metal surface of work function W0. The de Broglie wavelength of the ejected electron of mass m is :