Fundamentholfundamenthol
JEE Main2019Chemistry
Q.

What is the work function of the metal if the light of wavelength 4000 generates photoelectrons of velocity 6 × 105 ms–1 from it?

(Mass of electron = 9 × 10–31 kg

 Velocity of light = 3 × 108 ms–1

Planck’s constant = 6.626 × 10–34 Js

Charge of electron = 1.6 × 10–19 JeV–1)

  1. A

    4.0 eV 

  2. B

    2.1 eV

  3. C

    3.1 eV 

  4. D

    0.9 eV

Solution

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