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What are photoelectrons ?...

What are photoelectrons ?

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These are the electrons emitted from a metal surface when it is exposed to electro magnetic radiations of a suitable frequency.
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a. Every metal has a definite work function. Why all photoelectrons do not come out with the same energy of incident radiation in monochromatie ? Why there is an energy distribution of photoelectrons? b. The energy and momentum of an electron are related to the frequency and wave-length of the associated matter wave by the relations, E=h upsilon, p=(h)/(lambda) But while the value of lambda is physically significant, the value of upsilon (and therefore the value of the phase speed upsilon lambda has no physical significance. Why?

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The threshold wavelength of a metal is ( lambda_0). Light of wavelength slightly less than lambda_0 is incident on an insulated plate made of this metal. It is found that photoelectrons are emitted for sometimes and after that the emission stops. Explain.

A small metal plate of work function phi is kept at a distance r from a singly ionised, fixed ion. A monochromatic light beam is incident on the metal plate and photoelectrons are emitted. Find maximum wavelength of the light beam so that some of that electrons may go round the ion along a circle.

The maximum kinetic energy of a photoelectron is 3eV . What is its stopping potential ?

The stopping potential in an experiement on photoelectric effect is 2V. What is the maximum kinetic energy of the photoelectrons emitted ?

The stopping potential in an experiment on photoelectric effect is 1.5V. What is the maximum kinetic energy of the photoelectrons emitted ?

All the photoelectrons are not emitted with same energy. Give reason.

If the frequency of light in a photoelectron experiment is doubled the stopping potential will