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Define photoelectric effect...

Define photoelectric effect

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(a) Define Photoelectric effect ? Mention its one practical application in daily life. (b) Electrons are emitted with zero velocity from a mental surface when it is exposed to radiation of wavelength 6800 Å. Calculate thresholds freqency (V_o) and work function (W_o) of the mental.

Define the term 'stopping potential' in relation to photoelectric effect.

Knowledge Check

  • In photoelectric effect

    A
    photons come out of a metal when it is hit by a beam of electrons
    B
    photons come out of the nucleus of an atom under the action of an electric field
    C
    electrons come out of a metal with a constant velocity which depends on the frequency and intensity of incident radiation
    D
    electrons come out of a metal with different velocities nor greater than a certain value which depends only on the frequency of the incident light and not on its intensity

  • In photoelectric effect

    A
    light energy is converted into the heat energy
    B
    light is converted into electric energy
    C
    light energy is converted into the sound energy
    D
    electric energy is converted into light energy

  • In photoelectric effect,

    A
    the emission of electron is the result of elastic collision between the incident photon and the electron.
    B
    absorption of photon is a gradual process.
    C
    the emission of electron is a result of inelastic collision between the photon and the electron.
    D
    at the threshold frequency, the kinetic energy of ejected electrons is maximum.

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    Define the term 'stopping potential' in relation to photoelectric effect.

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    Define the following in photoelectric effect phenomenon (a) (i) work function (ii) Stopping potential (cut-off potential) (b) calculate energy of photon of wavelenght 3.31 Å

    Explain the concept of photoelectric effect

    In photoelectric effect,

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