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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

UV radiation having a wavelength of 120 nm falls on gold metal, to which electrons are bound by 4.82 eV. What is the maximum kinetic energy of the ejected photoelectrons?

To determine

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

Explanation

Given:

Wavelength of radiation =λ=120 nm = 120×109 m

Speed of radiation =c=3×108 ms

Energy of the radiation =E=?

Binding Energy of electrons =Wo=4.82 eV

Plank's constant =h=4.14×1015 eV s

Maximum kinetic energy of the electrons =KEmax

Formula Used:

Energy of radiation is given as

  E=hcλ

Maximum kinetic energy is given as

  KEmax=EWo

Calculatio

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