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IIT JEE Advanced 2008 Paper 1
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Question : 4
Total: 69
Which one of the following statements is WRONG in the context of X- rays generated from a X-ray tube?
Wavelength of characteristic X-rays decreases when the atomic number of the target increases.
Cut-off wavelength of the continuous X-rays depends on the atomic number of the target.
Intensity of the characteristic X-rays depends on the electrical power given to the X-ray tube.
Cut-off wavelength of the continuous X-rays depends on the energy of the electrons in the X-ray tube.
Validate
Solution:
We know that
1
λ
=
R
(
Z
−
b
)
2
(
1
h
1
2
−
1
h
2
2
)
where b is the screening constant, R is the Rydberg’s constant, λ is the wavelength and Z is the atomic number. If Z increases, then λ also increases. Therefore,
λ
cut
−
off
=
h
c
e
V
is independent of Z. Hence, the statement is option (B) is wrong.
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