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In a photoelectric experiment, the wavelength of the light incident on a metal is changed from 300 nm to 400 nm . Choose the closest value of change in the stopping potential from given options h c e = 1240 nm · V

Options

  1. A2 . 0   V
  2. B0 . 5   V
  3. C1 . 0   V
  4. D1 . 5   V

Correct answer

C. 1 . 0   V

Step-by-step solution

v s 1 = 1240 300 - ϕ v s 2 = 1240 400 - ϕ v s 1 - v s 2 = 1240 300 - 1240 400 = 4 . 13 - 3 . 1 = 1 . 03 = 1

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