Question

why pressure is kept low in cathord ray experiment​

Answer 1

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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.

EXPERIMENT:

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

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.

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 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.

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.

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.

Answer 2

Explanation:

you need low pressure in the tube so that the passage of the beam of electronic is not impressed