A) velocity
B) intensity
C) frequency
D) polarization
Correct Answer: C
Solution :
The penetrating power of X-rays depends upon their wavelength. The frequency of the longer wavelength (approximately \[mg{{R}_{e}}\,.\]). X-rays is lower and so their energy is smaller. Hence, their penetrating power is weaker and they are called soft or less penetrating X-rays. The penetrating power of the shorter wavelength (approximately \[{{R}_{e}}\]). X-rays is stronger and they are called hard or highly penetrating X-rays. Hence, the difference between the two is only of frequency.
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