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(B) The colour of the positive column in a gas discharge tube is determined by the emission spectra of the gas atoms present within the tube. When an

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The gas in the tube

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(B) The colour of the positive column in a gas discharge tube is determined by the emission spectra of the gas atoms present within the tube. When an electric discharge passes through the gas,the gas atoms are excited and emit light of specific wavelengths upon de-excitation. Since different gases have different energy levels,they emit light of different colours. For example,air produces a purple-red glow,while hydrogen $(H_2)$ produces a blue glow.

The colour of the positive column in a gas discharge tube depends on

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