question_answer

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

A) \[\alpha \]-rays

B)                                        ultrasonic waves                             

C) X-rays                  

D)        \[\gamma \]-waves.

Correct Answer: C

Solution :

                When fast cathode rays strike a metal surface with high melting point, the cathode rays might transfer its K.E. to an electron in an inner shell, which eventually might come out of the metal surface. Due to the vacancy created in an inner orbit, some outer orbit electron might jump down to fill up the gap thereby emitting some electromagnetic radiation known as x-rays.