The kinetic energy of most energetic electrons emitted from a metallic surface is doubled when the wavelength , λ of the incident radiation is changed from 400 nm to 310 nm. The work function of the metal is
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a
0.9 e.V
b
1.7 e.V
c
2.2 e.V
d
3.1 e.V
answer is C.
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Detailed Solution
Ek=123754000−ϕ=3.1−ϕ02Ek=123753100−ϕ=3.99−ϕ06.2−2ϕ0=3.99−ϕ0 or ϕ0=6.2−3.99=2.21eV
The kinetic energy of most energetic electrons emitted from a metallic surface is doubled when the wavelength , λ of the incident radiation is changed from 400 nm to 310 nm. The work function of the metal is