Photoelectric EffectMedium
Question
The surface of zone material is radiated in turn by waves of 10λ = 350nmand 540 nm respectively. The ratio of the stoping potentinal in the two case is 2 : 1. The work function of the material is
Options
A.4.20eV
B.0.15 eV
C.2.10 eV
D.1.05 eV
Solution
Let the work function be φ
Enistein′s equation in photo-electricity,
hv = φ +
mv2
h
= φ + 
mv2 = φ + eV
[eV = mv2, V is stopping potential]
= φ + 2e. V .......(i)
= φ + e. V .......(ii)
⇒ 540φ + 540eV = 350φ + 700eV
⇒ 190φ = 160eV
φ =
eV
eV = 1.05eV
Enistein′s equation in photo-electricity,
hv = φ +
mv2 h
= φ + mv2 = φ + eV[eV = mv2, V is stopping potential]
= φ + 2e. V .......(i) = φ + e. V .......(ii)⇒ 540φ + 540eV = 350φ + 700eV
⇒ 190φ = 160eV
φ =
eV eV = 1.05eVCreate a free account to view solution
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