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AP EAMCET202021 Sep 2020Evening ShiftPhysicsDual Nature of MatterActual

The maximum velocity of an electron emitted by light of wavelength ( ) incident on the surface of a metal of work function ( ) is [ (h= ) Planck's constant, (m= ) mass of electron and (c= ) speed of light]

Options

  1. A( 2(h c+ ) m )
  2. B( 2(h c- ) m )
  3. C( 2(h c- ) m )
  4. D( 2(h - ) m )

Correct answer

C. ( 2(h c- ) m )

Step-by-step solution

According to Einstein's photoelectric equation, maximum kinetic energy of emitted electron is ( aligned & K_ = h c - 1 2 m v_ ^2= h c- & v_ ^2= 2(h c- ) m v_ = 2(h c- ) m aligned )

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