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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

Violet light of wavelength 400 nm ejects electrons with a maximum kinetic energy of 0.860 eV from sodium metal. What is the binding energy of electrons to sodium metal?

To determine

The binding energy in eV of the electrons ejected from sodium metal.

Explanation

Given:

Wavelength of radiation =λ=400 nm = 400×109 m

Speed of radiation =c=3×108 ms

Energy of the radiation =E=?

Binding Energy of electrons =Wo

Plank's constant =h=4.14×1015 eV s

Maximum kinetic energy of the electrons =KEmax=0.860 eV

Formula Used:

Energy of radiation is given as

  E=hcλ

Binding energy is given as

  Wo=EKEmax

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