Question

In: Physics

When light of wavelength 400 nm is incident on a metal surface, the stopping potential of...

When light of wavelength 400 nm is incident on a metal surface, the stopping
potential of the photoelectrons is 0.600 V.
a. What is the work function of the metal?
b. What is the threshold frequency?
c. What is the maximum kinetic energy of the electron?

Solutions

Expert Solution

According to Einstein's Photo electric equation, Incident Energy = Work Function + Kinetic Energy

  

Kinectic energy is cancelled by stopping potential to cancel out the current. Electrons are stopped by supply of Voltage V in opposite direction    

a. Work Function ,

Substituting,

  

  

b. Threshold frequency,    

c.

Kinectic energy is cancelled by stopping potential to cancel out the current. Electrons are stopped by supply of Voltage V in opposite direction       

  

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→ 0.= 6.626 * 10-34 * 3 * 108 - (1.6 * 10-19 +0.600 400 * 10-9

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genius_generous answered 2 years ago
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