Chapter 29, Problem 5PE

### 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

# Find the longest-wavelength photon that can eject an electron from potassium, given that the binding energy is 2.24 eV. Is this visible EM radiation?

To determine

The longest wavelength the photon that can reject an electron in potassium and if it lie in the visible range or not.

Explanation

Given:

Frequency of photon =f

Wavelength of photon =Î»

Speed of photon =c=3Ã—108Â ms

Energy of the photon =E=2.24Â eV

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

Formula Used:

Wavelength of the photon is given as

â€ƒâ€ƒÎ»=cf

Energy of photon is given as

â€ƒâ€ƒE=hf

Calculation:

Energy of photon is given as

â€ƒâ€ƒE=hf

Inserting the values

â€ƒâ€ƒ2.24=(4.14Ã—10âˆ’15)â€‰ff=2.244.14Ã—10âˆ’15f=5

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