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In an experiment on photoelectric effect...

In an experiment on photoelectric effect, the emitter and the collector plates are placed at a separation of 10cm and are connected through an ammeter without any cell.

A magnetic field B exists parallel to the plates. The work function of the emitter is 2.39 e V and the light incident on it has wavelengths between 400nm and 600nm. Find the minimum value of B for which the current registered by the ammeter is zero. Neglect any effect of space charge.

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Two metallic plates P (collector) and Q (emitter) are separated by a distance of 0.10 meter. These are connected through an ammeter without any cell. A magnetic field B exists parallel to the plates. Light of wavelength between 4000Å and 6000Å fall on the plate whose work function is 2.39eV. Calculate the minimum value of B for which the current registered with ammeter is zero. Use, h=6.6xx10^(-34)Js, e=1.6xx10^(-19)C

In a photocell the plates P and Q have a separation of 5 cm, which are connected through a galvanometer without any cell. Bichromatic light of wavelengths 4000 Å and 6000 Å are incidenton plate Q whose work- functionis 2.39 eV. If a uniform magnetic field B exists parallel to the plates, find the minimum value of B for which the galvanometer shows zero deflection.

Knowledge Check

  • Two metallic plates P(collector) and Q (emitter) are separated by a distance of 0.2 m. These are connected through an 0.2 m. These are connected through an ammeter without any cell. A magnetic field B exists parallel to the plates. Light of wavelengths between 2000 Å and 3000 Å fall of the plate Q whose work function is 2.22 eV. The minimum value of B for which the current registered with ammeter is zero, is

    A
    `3.8 xx10^-5 T`
    B
    `4.7 xx10^-5 T`
    C
    `6.7 xx10^-5 T`
    D
    `8.6 xx10^-5 T`

  • The photoelectric work function of the emitter of a photocell is 3.63 eV . The frequency of incident light radiation if the stopping potential of the emitter is 3 volt , is

    A
    `1. 1 xx 10^(15) ` Hz
    B
    `6.6 xx 10^(15)` Hz
    C
    `1.6 xx 10^(15)` Hz
    D
    `6.1 xx 10^(15)` Hz

  • The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on and a saturation photo current is recorded. An electric field is switched on which has a vertically downward direction

    A
    The photo current will increase
    B
    The kinetic energy of the electrons will increase
    C
    The stopping potential will decrease
    D
    The threshold wavelength will increase

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