Chapter 29, Problem 10PE

### 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

# 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 =Î»=400Â nmÂ =Â 400Ã—10âˆ’9Â m

Binding Energy of electrons =Wo

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

Maximum kinetic energy of the electrons =KEmax=0.860Â eV

Formula Used:

Energy of radiation is given as

â€ƒâ€ƒE=hcÎ»

Binding energy is given as

â€ƒâ€ƒWo=Eâˆ’KEmax

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