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VITEEE 2012 Solved Paper
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Section:
Physics
Share question:
© examsnet.com
Question : 2
Total: 120
The threshold frequency for a photo-sensitine metal is 3.3 x
10
14
Hz. If light of frequency 8.2 x
10
14
Hz is incident on this metal, the cut-off voltage for the photo-electric emission is nearly
2 V
3 V
5V
IV
Validate
Solution:
Here,
V
0
=
E
−
V
e
=
h
(
v
−
v
0
)
e
=
6.62
×
10
−
34
(
8.2
×
10
14
−
3.3
×
10
14
)
1.6
×
10
−
19
=
6.62
×
10
−
34
1.6
× 4.9 ×
10
33
=
6.62
×
4.9
×
10
−
1
1.6
V
0
= 2 volt
© examsnet.com
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