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Dual Nature of ...

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  • Question 1
    4 / -1

    When ultraviolet rays incident on metal plate then photoelectric effect does not occur, it occurs by incidence of

  • Question 2
    4 / -1

    The potential difference applied to an X – ray tube is 5kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is

  • Question 3
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    In Thomson’s experiment of finding e/m for electrons, beam of electron is replaced by that of muons (particle with same charge as that of electrons but of mass 208 times that of electron). No deflection condition in this case is satisfied if.

  • Question 4
    4 / -1

    The speed of an electron having a wavelength of 10-10 m is

  • Question 5
    4 / -1

    An X–ray photon has a wavelength 0.01Å. Its momentum (in kg ms-1) is (Given h = 6.6 × 10-34 Js)

  • Question 6
    4 / -1

    The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

  • Question 7
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    A charged oil drop is suspended in a uniform electric field of 3 × 104 V/m so that it neither falls nor rises . The charge on the drop will be (take the mass of the drop is 9.9 × 10-15 kg and g = 10 ms-2)

  • Question 8
    4 / -1

    Which of the following have highest specific charge?

  • Question 9
    4 / -1

    Particle A and B have electric charge + q and + 4 q. Both have mass m. If both are allowed to fall under the same p.d., ratio of velocities vA/vB =

  • Question 10
    4 / -1

    Energy of photon having wavelength λ is 2 eV. This photon when incident on metal. maximum velocity of emitted is v. If λ is decreased 25% and maximumu velocity is made double, work function of metal is ........ev

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