A) \[4\times {{10}^{4}}\,m/s\]
B) \[3\times {{10}^{8}}\,m/s\]
C) \[{{10}^{8}}\,m/s\]
D) \[3\,m/s\]
Correct Answer: B
Solution :
The velocity of X-rays is always equal to that of light.
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