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Physics, Science

12th -



Quantum Physics


20 questions

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  • 1. Multiple Choice
    30 seconds
    1 pt

    Photoelectrons will be ejected from a material surface if?

    The threshold frequency is greater than the photon frequency

    The work function is less than the photon energy

    The intensity of light is high enough

    The wavelength of photon is maximum

  • 2. Multiple Choice
    30 seconds
    1 pt

    A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.

    4.2 eV

    4.4 eV

    4.7 eV

    4.9 eV

  • 3. Multiple Choice
    30 seconds
    1 pt

    In an experiment, photoelectric effect is observed in metal A when light with frequency (f ) falls on the metal. If the light frequency used in this experiment is doubled, the photoelectrons

    Will not be ejected

    Will be ejected as observed in the previous

    Will be ejected with greater number of photoelectrons

    Will be ejected with greater kinetic energy

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