Q. The colour of the positive column in a gas discharge tube depends on
A) The type of glass used to construct the tube
B) The gas in the tube
C) The applied voltage
D) The material of the cathode
Explanation
(b) The colour of the positive column in a discharge tube depends on the type of gas $e.g.,$ for air, colour is purple red, for $H_{2}$ colour is Blue $e$tc
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.