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
Correct Answer: B
Solution :
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 etc.You need to login to perform this action.
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