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Light is incident on a metallic plate having work function 110 10⁻²⁰ ~J . If the produced photoelectrons have zero kinetic energy then the angular frequency of the incident light is _ _ _ _ rad/s. ( h =6.63 10⁻³⁴ ~J . s ) .

Options

  1. A1.04 10¹³
  2. B1.04 10¹⁶
  3. C1.66 10¹⁶
  4. D1.66 10¹⁵

Correct answer

B. 1.04 10¹⁶

Step-by-step solution

From Einstein's photoelectric equation, h = W + KE . With zero kinetic energy, h = W . The frequency is = W h = 110 10⁻²⁰ 6.63 10⁻³⁴ = 16.59 10¹⁴ Hz. The angular frequency is = 2 = 2 16.59 10¹⁴ = 104.25 10¹⁴ = 1.04 10¹⁶ rad/s.

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