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NEET 2018 Physics and Chemistry
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© examsnet.com
Question : 21
Total: 90
An electron of mass m with an initial velocity
→
V
=
V
0
∧
i
(
V
0
>
0
)
enter an electric field
→
E
=
−
E
0
∧
i
(
E
0
=
constant
>
0
)
at
t
=
0
.If
λ
0
is its de-Broglie wavelength initially, then its de-Broglie wavelength at time t is
[NEET 2018]
λ
0
(
1
+
e
E
0
m
V
0
t
)
λ
0
(
1
+
e
E
0
m
V
0
t
)
λ
0
λ
0
t
Validate
Solution:
👈: Video Solution
Initial de-Broglie wavelength
∴
λ
0
=
h
m
v
0
Acceleration of electron
a
=
e
E
0
m
Velocity after time ‘t’
V
=
(
V
0
+
e
E
0
m
t
)
So,
λ
=
h
m
v
=
h
m
(
V
0
+
e
E
0
m
t
)
=
h
m
V
0
[
1
+
e
E
0
m
V
0
t
]
=
λ
0
[
1
+
e
E
0
m
V
0
t
]
© examsnet.com
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