Chapter 29, Problem 9PE

### College Physics

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

Chapter
Section

### 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 =Î»=120Â nmÂ =Â 120Ã—10âˆ’9Â m

Binding Energy of electrons =Wo=4.82Â eV

Plank's constant =h=4.14Ã—10âˆ’15Â eVÂ s

Maximum kinetic energy of the electrons =KEmax

Formula Used:

Energy of radiation is given as

â€ƒâ€ƒE=hcÎ»

Maximum kinetic energy is given as

â€ƒâ€ƒKEmax=Eâˆ’Wo

Calculatio

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