Gases are generally maintained at very low pressures in a cathode ray tube:

To prevent collision between the atoms of the gas to form ions

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To slow down the speed of a moving atom to show phosphorescence

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To slow down the speed of moving ions to accept an electron

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So that there is enough space for the electrons to accelerate and produce more electrons.

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Solution

The correct option is D So that there is enough space for the electrons to accelerate and produce more electrons.
In the cathode ray tube experiment, the gas is maintained at a very low pressure up to $10^{- 3}$ mm Hg, so that there is enough space for electrons to accelerate before colliding with more atoms, ejecting a large number of free electrons.

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