In the phenomenon of electric discharge through gases at low pressure , the coloured glow in the tube appears as a result of

Options

A. excitation of electrons in the atoms
B. collision between the atoms of the gas
C. collisions between the charged particles emitted from the cathode and the atoms of the gas
D. collisions between different electrons of the atoms of the gas

Answer

C

Explanation

The discharge of electricity through rarefied gases is an interesting phenomenon which can be systematically studied with the help of a discharge tube . In discharge tube collisions between the charged particles emitted from the cathode and the atoms of the gas results to the coloured glow in the tube.