The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong? (a) Ultraviolet rays (b) γ -rays (c) X-rays (d) Infra-red rays

Answer: (c). λ = hc/E = (12400 eV Å)/(15000 eV) ≈ 0.83 Å Wavelengths around 0.1 to 10 Å (energies of a few keV to about 100 keV) are X-rays. So the answer is (c) X-rays.

The energy of the em waves is of the order of 15 keV. To which part… | NEET 2015 (AIPMT)

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Electromagnetic Spectrum & Atmosphere

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

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Answer: (c)

$\lambda = \dfrac{hc}{E} = \dfrac{12400\ \text{eV Å}}{15000\ \text{eV}} \approx 0.83\ \text{Å}$
Wavelengths around $0.1$ to $10\ \text{Å}$ (energies of a few keV to about 100 keV) are X-rays.
So the answer is (c) X-rays.

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