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Name the principle on which a Cathode Ra...

Name the principle on which a Cathode Ray Tube (CRT) works.

Text Solution

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Cathode Ray Tubes work on the principle of vacuum tubes.
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Knowledge Check

  • Light from a hydrogen discharge tube is incident on the cathode of a photocell. The work function of cathode surface is 4.2 eV. In order to reduce the photocurrent to zero, the voltage of the anode relative to the cathode must be made :

    A
    `-4.2 V`
    B
    `-9.4 V`
    C
    `-17.8 V`
    D
    `+9.4 V`

  • An electron is accelerated to a high speed down the axis of a cathode ray tube a by the application of a potential difference of V volt between the cathode and anode. The particle then passes through a uniform transverse magnetic field in which it experiences force F . If the potential difference between the anode and the cathode is increased to 2V , an electron will be now experience a force :

    A
    `F // sqrt(2)`
    B
    `F // sqrt(2)`
    C
    `sqrt(2) F`
    D
    2 F

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