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AP EAMCET2007PhysicsDual Nature of Matter

The work function of the nickel is 5 eV . When a light of wavelength 2000 Ã… falls on it, it emits photoelectrons in the circuit. Then the potential difference necessary to stop the fastest electrons emitted is (given .h=6.67 10⁻³⁴ ~J - s )

Options

  1. A1.0 ~V
  2. B1.75 ~V
  3. C1.25 ~V
  4. D0.75 ~V

Correct answer

C. 1.25 ~V

Step-by-step solution

Stopping potential is given by aligned e V₀ & = h c - e V₀ & = 6.67 10⁻³⁴ 3 10^8 2 10⁻⁷ aligned -5 1.6 10⁻¹⁹ aligned & =10.005 10⁻¹⁹-8 10⁻¹⁹ & =2.005 10⁻¹⁹ aligned or aligned V₀ & = 2.005 10⁻¹⁹ 1.6 10⁻¹⁹ volt & =1.25 ~V aligned

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