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VITEEE 2013 Solved Paper
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© examsnet.com
Question : 31
Total: 120
When a certain metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential for photoelectric current 3
V
0
. When the same surface is illuminated with a light of wave length 2λ, the stopping potential is
V
0
. The threshold wavelength for this surface to photoelectric effect is
4 λ
6 λ
8 λ
4
3
λ
Validate
Solution:
Here, case (i) e(
3
V
0
) =
h
c
λ
-
ϕ
0
... (i)
Case(11)
e
V
0
=
h
c
2
λ
-
Φ
0
... (ii)
From eqs. (i) and (ii),
3
h
c
2
λ
-
3
Φ
0
=
h
c
λ
−
Φ
0
or
3
h
c
2
λ
−
h
c
λ
=
3
Φ
−
Φ
0
=
h
c
2
λ
=
2
Φ
0
or
Φ
0
=
h
c
4
λ
∴ Threshold wavelength
l
0
=
h
c
Φ
0
=
h
c
h
c
× 4λ =
4
λ
© examsnet.com
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