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Question

The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong?

A
γ rays
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B
x rays
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C
Infra - red rays
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D
Ultraviolet rays
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Solution

The correct option is A x rays
E=hcλ
or λ=hcE=(6.6×1034)×(3×108)15×103×1.6×1019=0.8×1010m=0.8Ao
So it is nearly related to the X-ray wavelength.

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