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JEE Main20204 Sep 2020Morning ShiftPhysicsDual Nature of MatterActual

Given figure shows few data points in a photo-electric effect experiment for a certain metal. The minimum energy for ejection of electrons from its surface is: (Planck's constant h = 6.62 × 10 – 34 J.s )

Options

  1. A2.27  eV
  2. B2.59  eV
  3. C1.93  eV
  4. D2.10  eV

Correct answer

A. 2.27  eV

Step-by-step solution

Threshold Energy = hv = 6 .62 × 10 − 34 × 5 .5 × 10 14   J Work friction = 6 .62 × 5 .5 × 10 − 20 1 .6 × 10 − 19 eV = 2 .27   eV

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