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MHT CET202313 May 2023Evening ShiftPhysicsDual Nature of MatterActual

When radiations of wavelength ' ' is incident on a metallic surface the stopping potential required is 4.8 volt. If same surface is illuminated with radiations of double the wavelength, then required stopping potential becomes 1.6 volt. Then the value of threshold wavelength for the surface is

Options

  1. A2
  2. B4
  3. C6
  4. D8

Correct answer

C. 6

Step-by-step solution

We know, V = hc - ₀ 4.8= hc - ....(i) Given =2 1.6= h c 2 - ....(ii) Dividing (i) by (ii), 3 ( hc 2 - )= hc - 3 hc 2 -3 = ( hc - ) hc 2 =2 Threshold wavelength is 4

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