A radiation of wave length 2500 A0 is incident on a metal plate whose work function is 3.5 eV. Then the potential required to stop the fastest photo electrons emitted by the surface is :
(h=6.63×10−34Js and c=3×108 m/s)
2.94 V
1.47 V
3.5 V
4.9 V
A
2.94 V
B
1.47 V
C
3.5 V
D
4.9 V
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Solution
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Energy of photon E=hν=hcλ Given: λ=2500×10−10m
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Q1
A radiation of wave length 2500 A0 is incident on a metal plate whose work function is 3.5 eV. Then the potential required to stop the fastest photo electrons emitted by the surface is :
(h=6.63×10−34Js and c=3×108 m/s)
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Q2
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Q3
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Q5
The work function of a metal is 2.5 eV. The maximum kinetic energy of the photoelectrons emitted if a radiation of wavelength 3000Ao falls on it is :