Q127 / 180 · NEET 2015 (Phase 2) · Physics

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

A
Infra-red rays
B
Ultraviolet rays
C
$γ$ -rays
Correct answer
D
X-rays

Solution

Wavelength of the ray

λ = \frac{h c}{E} = \frac{12400}{15000}

= 0.826 Å

X-ray wavelengths are in the range

0.5 - 2.5 Å

, so it is an X-ray.

Hence, the correct answer is option: 'D'.

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