Assertion : Cathode rays are a stream of `alpha`-particles.
Reason : They are generated under high pressure and high voltage.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If the assertion and reason both are false

Answer

D

Explanation

Both assertion and reason are false. Cathode rays are stream of electrons. They are generated through gases at low pressure and high voltage.