Question

When cathode rays strike a metal target of high melting point with a very high velocity then which of the following are produced?

• A. $\gamma$-waves
• B. Ultrasonic
• C. X- rays
• D. $\alpha$-rays

Answer 1

Answer: (C)

X- rays

When cathode rays strike a metal target of high melting point with a very high velocity then X-rays are produced.
When cathode rays (electrons, having high velocity) strike a metal target of high melting point , they knocks out inner electrons of the atoms of the target material. To fill up this vacancy, electrons from higher energy level make transition to lower level resulting in emission of radiation. If target material has very high atomic number then the emitted radiation is X-ray.