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AP EAMCET201921 Apr 2019Evening ShiftChemistryStructure of AtomActual

Which of the following equations represents the velocity ( v ) of the ejected electrons when a metal is made to strike with light of frequency v and the threshold frequency of the metal is v 0 ? m e = mass of electron and h is Planck's constant).

Options

  1. Av = h v - v 0 m e
  2. Bv = 2 h v - v 0 m e
  3. Cv = h v - v 0 2 m e
  4. Dv = h v - v 0 m e

Correct answer

B. v = 2 h v - v 0 m e

Step-by-step solution

As in case of photoelectric effect, incident radiation energy is equal to the sum of threshold energy and kinetic energy. h v = h v 0   +   1 2 m e v 2 v 2 = 2 h ( v - v 0 ) m e v = 2 h ( v - v 0 ) m e

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