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Problem
Problem
Determine the energy of the characteristic X-ray (
K
β
K_\beta
K
β
) emitted from a tungsten (
Z
=
74
Z = 74
Z
=
74
) target when an electron drops from the
M
M
M
-shell (
n
=
3
n = 3
n
=
3
) to a vacancy in the
K
K
K
-shell (
n
=
1
n = 1
n
=
1
).
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