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MHT CET 2020 Physics Solved Paper
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© examsnet.com
Question : 39
Total: 50
An electron of mass
m
and charge e initially at rest gets accelerated by a constant electric field
E
. The rate of change of de-Broglie wavelength of this electron at time
t
ignoring relativistic effects is
−
h
e
E
t
2
−
eht
E
−
m
h
e
E
t
2
−
h
e
E
Validate
Solution:
Here,
u
=
0
;
a
=
e
E
m
;
v
=
?
;
t
=
t
∴
v
=
u
+
a
t
=
0
+
e
E
m
t
de-Broglie wavelength,
λ
=
h
m
v
=
h
m
(
e
E
t
∕
m
)
=
h
e
E
t
Rate of change of de-Broglie wavelength
d
λ
d
t
=
h
e
E
(
−
1
t
2
)
=
−
h
e
E
t
2
© examsnet.com
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