The energy of an EM wave is of the order of 15keV. 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 CX-rays λ=hcE Here, E= 15KeV hc = 1240eVnm ∴λ=1240eVnm15×103eV=0.083nm As the wavelength range of X−rays is from 1 nm to 10−3nm, this wavelength belongs to the X−rays part of the spectrum.