Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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For Harder X-rays, - Physics

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Question

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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Solution For Harder X-rays, Concept: Electromagnetic Spectrum.
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