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Why cathode rays are produced only when ...

Why cathode rays are produced only when the pressure of the gas inside the discharge tube is very low ?

Text Solution

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At higher pressure (e.g., at 1 atomospheric pressure), no electric current flows through the tube because gases are poor conductor of electricity.
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The nature of _____ rays depends upon the nature of the gas in the discharge tube.

Anode rays are also produced along with cathode rays in the discharge tube under low pressure. Justify

Knowledge Check

  • Cathode rays are produced when the pressure is of the order of

    A
    2cm of Hg
    B
    `0.1` cm of Hg
    C
    0.01 mm of Hg
    D
    `1 mu m` of Hg

  • Low pressure is maintained in the discharge tube to

    A
    increase the number of molecules
    B
    increase ionisation of gas molecules
    C
    decrease the velocity of the rays coming from the cathode
    D
    all of above

  • The pressure of gas in cathode ray tube is

    A
    `10^-2 mm`
    B
    `10^-3 mm` of mercury
    C
    `10^5 N//m^2`
    D
    1 mm of mercury

    • Similar Questions

    Explore conceptually related problems

    "Anode rays are also produced along with cathode rays in the discharge tube pressure ". Justify.

    The cathode rays are produced when a gas at a very low pressure is subjected to an electric discharge .

    What is wrong about cathode rays? I They ionise the gases inside the discharge tube II They produce x-rays when strike on the surface of "W,Cu", Mo etc IIITheir e/m value depends on the nature of residual gas IV They deflected by both electric and magnetic field

    Low pressure is maintained in the discharge due to

    Canal rays produced when hydrogen atoms are taken in the discharge tube constitutes

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