The colour of anode glow is ______________when filled with carbon dioxide at a pressure of 5 mm of Mercury.

deep red

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blue

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green

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white

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Solution

The correct option is D
white

The colour of the anode glow depends upon the nature of the gas. It is called anode glow. It occour at the pressure of 5 mm of mercury.
If carbon dioxide gas is filled in the vacuum tube the glow is white.
Hence the (d) is the correct option.

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When the pressure of a gas in a discharge tube is reduced from 5 mm to 0.05 mm of Mercury the anode glow:

m m

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