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NEET2012PhysicsDual Nature of MatterActual

A photon is incident having frequency 1 10¹⁴ sec ⁻¹ . Threshold frequency of metal is 5 10¹³ sec ⁻¹ . Find the kinetic energy of the ejected electron.

Options

  1. A3.3 10⁻²¹ ~J
  2. B6.6 10⁻²¹ ~J
  3. C3.3 10⁻²⁰ ~J
  4. D6.6 10⁻²⁰ ~J

Correct answer

C. 3.3 10⁻²⁰ ~J

Step-by-step solution

The relation between kinetic energy, threshold frequency and frequency of photon is given as 1 2 m v^2= (h v-h v₀ )=h (1 10¹⁴-5 10¹³ )k=h (5 10¹³ )=6.67 10⁻³⁴ 5 10¹³=3.3 10⁻²⁰ ~J

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