   Chapter 29, Problem 13PE

Chapter
Section
Textbook Problem

Find the wavelength of photons that eject 0.100-eV electrons from potassium, given that the binding energy is 2.24 eV. Are these photons visible?

To determine

The wavelength of the radiation and the type of radiation.

Explanation

Given:

Wavelength of radiation =λ=?

Speed of radiation =c=3×108 ms

Energy of the radiation =E=?

Binding Energy of electrons =Wo=2.24 eV

Plank's constant =h=4.14×1015 eV s

Kinetic energy of the electrons =KEmax=0.100 eV

Formula Used:

Energy of radiation is given as

E=hcλ

Energy of radiation is given as

E=Wo+KEmax

Calculation:

Energy of radiation is given as

E=Wo+KEmax

Inserting the values

E=2

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