Distinguish between soft X-rays and hard X-rays.

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Solution

Soft X-ray Hard X-ray
(i) X-ray having wave length of $4 A^{\circ}$ or above, have lesser frequency and hence lesser energy called soft X-ray. (i) X-ray having low wavelength of the order of $1 A^{\circ}$ have high frequency and hence high energy called hard X-ray.
(ii) Low penerating power. (ii) High penerating power.
(iii) They are produced at comparatively low potential difference. (iii) They are produced at comparatively high potential difference.

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Soft X-ray	Hard X-ray
(i) X-ray having wave length of $4 A^{\circ}$ or above, have lesser frequency and hence lesser energy called soft X-ray.	(i) X-ray having low wavelength of the order of $1 A^{\circ}$ have high frequency and hence high energy called hard X-ray.
(ii) Low penerating power.	(ii) High penerating power.
(iii) They are produced at comparatively low potential difference.	(iii) They are produced at comparatively high potential difference.