Question

what will happen if we will use high temperature and high pressure in discharge tube ​

Answer 1

Answer:

it will fatting the tube

Answer 2

Answer:

Explanation:If the cathode ray experiment has a beam of electrons hitting a fluorescent screen which glows then:

You need the low pressure in the tube so that the passage of the beam of electrons is not impeded very much by collision with air molecules.

You need a reasonably high accelerating voltage to give the electrons enough kinetic energy to make the fluorescent screen glow when the electrons hit the screen.

If the cathode ray experiment uses a discharge tube which emits light then the electrons must be accelerated enough (obtain enough kinetic energy) between collision with the gas molecules in the tube to excite/ionise the gas molecules on collision with them.

So a low pressure ensures that the distance between collision is sufficiently large to enable the electron to cause excitation/ionisation of the gas molecules.

On the other hand if there are too few gas molecules the intensity of the emitted would be too small to observe the emitted light.

This means that the gas pressure must not to be too low thus decreasing the distance the electrons travel between collisions with the gas molecules.

Having a high voltage across the tube means that an electron can gain more kinetic energy between collisions with the air molecules and thus a smaller distance between gas molecules (not quite so low a pressure) can be used.

So there is a compromise between the values of voltage and pressure.

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