Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12

# For Harder X-rays, - Physics

Short Note

For harder X-rays,
(a) the wavelength is higher
(b) the intensity is higher
(c) the frequency is higher
(d) the photon energy is higher.

#### Solution

(c) the frequency is higher
(d) the photon energy is higher

Harder X-rays are the X-rays having low wavelengths. Since the frequency varies inversely with the wavelength, hard X-rays have high frequency.

Energy of a photon (E) is given by

E = (hc)/lambda

Here,
h = Planck's constant
c = Speed of light
λ  = Wavelength of light.
Clearly, energy varies inversely with wavelength. Therefore, the energy of the photon will be higher for the hard X-ray.

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#### APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 22 X-rays
MCQ | Q 1 | Page 394