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Define photoelectric effect and state th...

Define photoelectric effect and state the laws of photoelectric emission.

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Laws of photoelectric emission are as follows :
(1) The velocity of electrons emitted is independent of the intensity of light and depends only upon the frequency (or wavelength) of the incident light.
(2) Photoelectric current (or the number of photoelectrons ejected per second) is proportional to intensity of incident light.
(3) For a given metal, there exists a certain minimum frequency below which the emission of electrons stops completely. This frequency is called the threshold frequency.
(4) Photoelectric emission is an instantaneous process.
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Describe photoelectric effect and state the laws of photoelectric emission.

(a) State the laws of photoelectric emission.

Knowledge Check

  • 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
    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
    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.

    • Similar Questions

    Explore conceptually related problems

    State laws of photoelectric emission. Establish Einstein photo-electric relation. Explain the laws of photoelectric emission on the bassis of this relation.

    What is photoelectric effect? Explain experimentally the variation of photoelectric current with (i) the intensity of the incident light (ii) the potential difference between the plates and (iii) the frequency of the incident light and hence state the laws of photoelectric emission.

    What is photoelectric effect? State the result of photoelectric effect experiment.

    In photoelectric effect,

    If the wavelength of light in an experiment on photoelectric effect is doubled, (i) the photoelectric emission will not take place (ii) the photoelectric emission may or may not take place (iii) the stopping potential will increase (iv) the stopping potential will decrease

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