In an X ray tube , the accelerating voltage for the electrons is increased from 15000 V to 30000 V. then the speed of the emitted X rays inside the tube will be

Options

A. a) `3xx10^8 m//s`
B. b) `6xx10^8 m//s`
C. c) `1.5 xx10^8 m//s`
D. d) `2xx10^8 m//s`

Answer

A

Explanation

X - rays are em waves and they travel with the speed of `3xx10^8 m//s` inside the tube. Change of V will not affect their speed.