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MHT CET202019 Oct 2020Evening ShiftPhysicsDual Nature of MatterActual

If the maximum kinetic energy of emitted electrons in photoelectric effect is 3 2 10⁻¹⁹ ~J and the work function for metal is 6 63 10⁻¹⁹ ~J , then stopping potential and threshold wavelength respectively are [Planck's constant . h =6.63 10⁻³⁴ ~J . s ] [Velocity of light . c =3 10⁸ m s ] [ . charge on electron .=1 6 10⁻¹⁹ C ]

Options

  1. A3 ~V , 4000 Å
  2. B4 ~V , 6000 Å
  3. C1 ~V , 1000 Å
  4. D2 ~V , 3000 Å

Correct answer

D. 2 ~V , 3000 Å

Step-by-step solution

(D) array l ( k E )_ = eV _ s =3.2 10⁻¹⁹ ~J V _ s = 3.2 10⁻¹⁹ 1.6 10⁻¹⁹ =2 ~V array In the given options, only option (D) has V _ s =2 ~V

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