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AP and TS EAMCET Engineering Model Paper 10
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© examsnet.com
Question : 113
Total: 160
The kinetic energies of photo electron emitted from a metal are
K
1
and
K
2
when irradiated with radiations of wave lengths
λ
1
and
λ
2
respectively. The work function of the metal is
K
1
λ
1
−
K
2
λ
2
λ
2
−
λ
1
K
1
λ
2
−
K
2
λ
1
λ
2
−
λ
1
K
1
λ
2
+
K
2
λ
1
λ
2
+
λ
1
K
1
λ
1
+
K
2
λ
2
λ
1
+
λ
2
Validate
Solution:
h
c
λ
1
=
K
1
+
W
→
(
1
)
and
h
c
λ
2
=
K
2
+
W
→
(
2
)
(
1
)
(
2
)
⇒
W
=
K
1
λ
1
−
K
2
λ
2
λ
2
−
λ
1
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