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Grade: 12

Light of wavelength 2000A falls on an aluminium surface (work function of Al = 4.2ev ) to cause photoelectric emission. the stopping of potential in volt of the metal is??

9 years ago

Answers : (2)

AKASH GOYAL AskiitiansExpert-IITD
419 Points

Dear Aishwarya

According to Einstein's photoelectric equation

  hv = Φ0 + (KE)max = Φ0 + eVs, where Φis work function and Vs is stopping potential
  hv= hc/λ= 6.633 x 10-34 x 3 x 108 x/2000 x 10-10
     = 9.95 x 10-19 J = 9.95/1.6 eV= 6.22 eV
eVs= 6.22 - 4.2 = 2.02 eV
Vs= 2.02 volt

All the best.                                                           


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9 years ago
Aiswarya Ram Gupta
35 Points
9 years ago
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