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College Physics

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

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Section
BuyFindarrow_forward

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 =λ

Speed of photon =c=3×108 ms

Energy of the photon =E=2.24 eV

Plank's constant =h=4.14×1015 eV s

Formula Used:

Wavelength of the photon is given as

  λ=cf

Energy of photon is given as

  E=hf

Calculation:

Energy of photon is given as

  E=hf

Inserting the values

  2.24=(4.14×1015)ff=2.244.14×1015f=5

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