Electrons are emitted with zero velocity | Class 11 Chemistry Chapter Structure of Atom, Structure of Atom NCERT Solutions

Question:

Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate threshold frequency (v0) and work function (W0) of the metal.

Answer:

Given λ = 6800 amgstrom or 6800x 10-10 m = 6.8 x 10-7m

C = 3 x 108 m/s

Also λ = c/v or v = c/ λ Therefore putting the values in the equation, we get

=3 x 108 / 6.8 x 10-7m = 4.41 x 1014 s-1

Hence, work function (W0) of the metal = 0

= (6.626 × 10–34 Js) (4.41 × 1014 s–1)

= 2.922 × 10–19 J

 


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Comments

  • Katha Ghosh
  • 2019-12-09 17:47:31

Thanks


  • Arpita Mohanty
  • 2019-08-06 10:48:49

Work function=h*threshold frequency Not h*frequency


  • Bandit singh
  • 2019-06-01 12:13:12

Thanx


  • Zawed Alam
  • 2019-05-05 22:49:21

Thanks


  • Zawed Al
  • 2019-05-05 22:48:27

Thaks


  • Susmita paul
  • 2019-01-16 17:21:39

Thank you so much


  • Bill Gates
  • 2018-09-17 15:49:58

Thank you very much


  • Anupam sharma
  • 2018-07-15 16:10:46

Tq very much


  • priya
  • 2018-07-08 19:45:41

velocity of light


  • ath
  • 2016-06-29 08:38:10

c is what and how 3*10*8


Comment(s) on this Question

Welcome to the NCERT Solutions for Class 11 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 12: Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wav....