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CBSE Questions for Class 12 Medical Physics Dual Nature Of Radiation And Matter Quiz 16 - MCQExams.com
CBSE
Class 12 Medical Physics
Dual Nature Of Radiation And Matter
Quiz 16
An electron (of mass m) and a photon have the same energy E in the range of a few eV. The ratio of the de-Broglie wavelength associated with the electron and the wavelength of the photon is (c = speed of light in vacuum)
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0%
1
c
(
E
2
m
)
1
/
2
0%
c
(
2
m
E
)
1
/
2
0%
(
E
2
m
)
1
/
2
0%
1
c
(
2
E
m
)
1
/
2
Explanation
For electron
De - Broglie wavelength
λ
c
=
h
p
where p is momentum
p
=
m
v
also by energy we have
E
=
1
2
m
v
2
⇒
E
=
1
2
p
2
m
⇒
p
=
√
2
m
E
∴
λ
c
=
h
√
2
m
E
For photon energy
⇒
E
=
h
c
λ
⇒
λ
=
h
c
E
∴
λ
c
λ
=
h
√
2
m
E
E
h
c
=
1
C
√
E
2
m
option (A) is correct.
A particle moving with kinetic energy E has de Broglie wavelength
λ
. If energy
Δ
E
is added to its energy, the wavelength become
λ
/
2
. Value of
Δ
E
, is?
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0%
2
E
0%
4
E
0%
3
E
0%
E
Explanation
For Partial,
λ
=
h
√
2
×
(
K
.
E
)
×
m
λ
∝
1
√
K
.
E
λ
1
λ
2
=
√
(
K
.
E
)
2
(
K
.
E
)
1
=
√
(
E
+
Δ
E
E
)
(
λ
λ
/
2
)
2
=
E
+
Δ
E
E
4
=
1
+
Δ
E
E
3
=
Δ
E
E
Δ
E
=
3
E
Option (C) is correct.
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