Home Physics Electron, Photon, Photoelectric Effect and X-rays Cathode Rays and Positive Rays The colour of the positive column in a gas d…
Physics Electron, Photon, Photoelectric Effect and X-rays Cathode Rays and Positive Rays MCQ (Single Correct)

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

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The correct answer is:
B

The colour of the positive coulum in a discharge tube depends on the type of gas e.g., for air, colour is purple red, for , colour is blue etc.

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