Question

Explain about the Photoelectric effect.

Answer 1

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$<b>*PHOTOELECTRIC EFFECT:-$
° WHEN METAL SURFACES ARE EXPOSED TO ELECTROMAGNETIC RADIATION WITH SUFFICIENT ENERGY THEY ABSORB THE PHOTONS OF ENERGY AND EMIT ELECTRONS.

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Answer 2

Answer:

When a beam of light of sufficient energy is allowed to strike a surface of a metal, electrons are ejected. This phenomenon is known as photoelectric effect and the ejected electrons are called photo electrons. The features of photoelectric effect are as follows:

• (1) The incident light must have certain minimum frequency (or energy) required to eject electrons from a particular metal. This frequency is called threshold frequency (V_o) and the energy associated with this frequency is called threshold energy.
• (2) The energy of emitted photoelectrons is given by Einstein's photoelectric equation, hv = hv_o + mv^2 where m and v are mass and velocity of photoelectrons.
• (3) Einstein considered electromagnetic radiation as a stream of photons of energy hv. A photon has zero rest mass. (Planck's constant, h = 6.626 x 10^-34 Js)