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NEET-XII-Physics

11: Dual Nature Of Radiation And Matter

Qstn# 2-a Prvs-QstnNext-Qstn
  • #2-a
    maximum kinetic energy of the emitted electrons,
    (b) Stopping potential, and
    (c) maximum speed of the emitted photoelectrons?
    Ans : The maximum kinetic energy is given by the photoelectric effect as:



    Where,

    h = Planck’s constant = 6.626 × 10-34 Js



    Hence, the maximum kinetic energy of the emitted electrons is 0.345 eV.
    (b) For stopping potential, we can write the equation for kinetic energy as:



    Hence, the stopping potential of the material is 0.345 V.
    (c) Maximum speed of the emitted photoelectrons = v

    Hence, the relation for kinetic energy can be written as:



    Where,

    m = Mass of an electron = 9.1 × 10-31 kg



    Hence, the maximum speed of the emitted photoelectrons is 332.3 km/s.
  • #2-b
    Stopping potential, and
    Ans : For stopping potential, we can write the equation for kinetic energy as:



    Hence, the stopping potential of the material is 0.345 V.
  • #2-c
    maximum speed of the emitted photoelectrons?
    Ans : Maximum speed of the emitted photoelectrons = v

    Hence, the relation for kinetic energy can be written as:



    Where,

    m = Mass of an electron = 9.1 × 10-31 kg



    Hence, the maximum speed of the emitted photoelectrons is 332.3 km/s.