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Class 12 NEET Physics Dual Nature of Matter and Radiation
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© examsnet.com
Question : 2
Total: 104
If
ϕ
is the work function of photosensitive material in
eV
and light of wavelength of numerical value
λ
=
h
c
e
metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take
h
-Plank's constant,
c
-velocity of light in free space) is (in SI units):
[NEET 2024 Re]
e
+
2
ϕ
2
e
−
ϕ
e
−
ϕ
e
+
ϕ
Validate
Solution:
(K.E)
)
max
=
h
c
λ
−
ϕ
0
and
λ
=
h
c
e
⇒
(
K
.
E
)
max
=
h
c
h
c
e
−
ϕ
0
⇒
(
K
.
E
)
max
=
e
−
ϕ
0
⇒
(
K
.
E
.
)
max
=
e
−
ϕ
© examsnet.com
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