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Question

The energy of an EM wave is of the order of 15 keV. To which part of the spectrum does it belong?

A
Ultraviolet rays
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B
γ-rays
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C
X-rays
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D
Infrared rays
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Solution

The correct option is C X-rays
λ=hcE
Here, E= 15KeV
hc = 1240eV nm
λ=1240 eV nm15×103 eV=0.083 nm
As the wavelength range of Xrays is from 1 nm to 103 nm, this wavelength belongs to the Xrays part of the spectrum.

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