Q. If the operating potential of an $X$-ray tube is $50\ kV,$ the velocity of $X$-rays coming out of it is
A) $4 \times 10^{4}m/s$
B) $3 \times 10^{8}m/s$
C) $10^{8}m/s$
D) $3m/s$
Explanation
(b) The velocity of $X$-rays is always equal to that of light
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.