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Question
Physics
The Kα X -ray emission line of tungsten occurs at λ =0.021nm . The energy difference between K and L levels in this atom is about
Q. The
K
α
X
-ray emission line of tungsten occurs at
λ
=
0.021
nm
. The energy difference between
K
and
L
levels in this atom is about
619
138
NTA Abhyas
NTA Abhyas 2022
Report Error
A
0.51
M
e
V
B
1.2
M
e
V
C
59
k
e
V
D
13.6
e
V
Solution:
λ
k
α
=
0.021
nm
=
0.21
A
∘
The wavelength
λ
k
α
corresponds to the transition of an electron from
L
shell to
K
shell.
The energy is expressed as
E
=
λ
h
c
Therefore,
E
L
−
E
K
=
λ
(
in
A
∘
)
12375
e
V
=
0.21
12375
≈
58928
e
V
or
Δ
E
=
59
k
e
V
.