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Dual Nature of ...

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  • Question 1
    4 / -1

    In photoelectric effect, the photocurrent

  • Question 2
    4 / -1

    A metal surface of work function 1.07 eV is irradiated with light of wavelength 332 nm. The retarding potential required to stop the escape of photoelectrons is

  • Question 3
    4 / -1

    The threshold frequency for photo electric effect on sodium corresponds to a wavelength of 5000Å. Its work function is

  • Question 4
    4 / -1

    Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photo electric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes .

  • Question 5
    4 / -1

    X – rays of frequency v are used to irradiate sodium and copper surface in two separate experiments and the stopping potential determined . Then

  • Question 6
    4 / -1

    If E and p are the energy and the momentum of a photon respectively then on increasing the wavelength of photon

  • Question 7
    4 / -1

    If the uncertainty in the position of an electron is 10-10 m, then the value of uncertainty in its momentum (in kg–ms-1) will be

  • Question 8
    4 / -1

    If the X – ray tube is working at 20 kv then the minimum wavelength of X – rays will be

  • Question 9
    4 / -1

    An X – ray tube is operated at an accelerating potential of 40 kV and the current in the tube is 20 mA. Only 2% of the total energy given is converted into X – rays. The maximum energy of emitted radiations will be

  • Question 10
    4 / -1

    In photoelectric effect, the work function of a metal is 3.5 eV. The emitted electrons can be stopped by applying a potential of –1.2 V. Then

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