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Light Emitting Diode

for a monochr...

Question

for a monochromatic radiation incident on a photosensitive surface why do all photoelectrons not come out with the same energy??

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Q. Every metal has a definite work function. Why do all the photo-electrons not come out with the same energy, if incident radiation is monochromatic?

Q. Every metal has a define work function. Why do all photo-electrons not come out with the law energy if incident radiation is monochromatic? Why is there an energy distribution of photo-electrons?

Q. The kinetic energy of photoelectrons emitted by a photosensitive surface depends on the intensity of the incident radiation.

Q. Radiation of frequency ν is incident on photosensitive metal. Maximum kinetic energy of the photoelectrons is E. If the frequency of incident radiation is doubled, find out the maximum kinetic energy of photoelectrons.

Q. Explain giving reasons for the following :
(a) Photoelectric current in a photocell increases with the increase in the intensity of the incident radiation.
(b) The stopping potential

(V_{0})

varies linearly with the frequency (

ν

) of the incident radiation for a given photosensitive surface with the slope remaining the same for different surfaces.
(c) Maximum kinetic energy of the photoelectrons is independent of the intensity of incident radiation.

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Light Emitting Diode

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