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MHT CET20228 Aug 2022Morning ShiftPhysicsDual Nature of MatterActual

In a photoelectric emission experiment, the stopping potential for a given metal is V volt, when radiation of wavelength is used. If radiation of wavelength 2 is used with the same metal, then the stopping potential (in volt) will be [ c = velocity of light, e= charge on electron, h= Planck's constant ]

Options

  1. AV- h c 2 e
  2. BV+ h c 2 e
  3. CV 2
  4. D2 V

Correct answer

A. V- h c 2 e

Step-by-step solution

According to Einstein's equation of photo-electric effect: e V= h c - ---(1) where, stopping potential is V, the incident wavelength and the work-function of the metal. Now, if the incident wavelength is switched to 2 , the stopping potential can be written as e V^ = h c 2 - ---(2) On subtracting equation (1) and (2), and subsequently rearranging: V^ =V- h c 2 e

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