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KVPY2013PhysicsDual Nature of Matter

In a photocell circuit the stopping potential, V₀ , is a measure of the maximum kinetic energy of the photoelectrons. The following graph shows experimentally measured values of stopping potential versus frequency v of incident light. The values of Plank's constant and the work function as determined from the graph are (taking the magnitude of electronic charge to be . e =1.6 10⁻¹⁹ C )

Options

  1. A6.4 10⁻³⁴ Js , 2.0 eV
  2. B6.0 10⁻³⁴ Js , 2.0 eV
  3. C6.4 10⁻³⁴ Js , 3.2 eV
  4. D6.0 10⁻³⁴ Js , 3.2 eV

Correct answer

B. 6.0 10⁻³⁴ Js , 2.0 eV

Step-by-step solution

V = hv e - Hence from graph =2 eV array l h e = slope = 6 1.6 10¹⁵ ~h = 6 1.6 10⁻¹⁹ 1.6 10¹⁵ =6.0 10⁻³⁴ array

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