When the pressure of gas in discharge to which reduced from 5 mm to 0.5 mm of Mercury, faraday's dark space becomes:

Bigger and shifts towards anode

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Smaller and shift toward announce

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Remains for the same size

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Disappears

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Solution

The correct option is A
Bigger and shifts towards anode

When the pressure of a gas in a discharge tube is reduced from 5 mm to 0.05 mm of Mercury the anode glow becomes smaller and breaks into small dancing disclets called striations.
The negative glow moves towards the anode.
The Faraday's dark space becomes bigger and moves towards the anode.
Hence, option A is correct.

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