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12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 3 Mark Questions with Solution Part - II Question Bank Software Jun-01 , 2021

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12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 3 Mark Questions with Solution Part - II

12th Standard English Medium Physics Subject Dual Nature of Radiation and Matter Book Back 3 Mark Questions with Solution Part - II

12th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 15

    Part I

    5 x 3 = 15

  1. Explain experimentally observed facts of photoelectric effect with the help of Einstein’s explanation.

  2. Derive an expression for de Broglie wavelength of electrons.

  3. Describe briefly Davisson – Germer experiment which demonstrated the wave nature of electrons.

  4. A radiation of wavelength 300 nm is incident on a silver surface. Will photoelectrons be observed? [work function of silver = 4.7 eV]

  5. The work function of potassium is 2.30 eV. UV light of wavelength 3000 Å and intensity 2 Wm–2 is incident on the potassium surface.
    i) Determine the maximum kinetic energy of the photo electrons
    ii) If 40% of incident photons produce photo electrons, how many electrons are emitted per second if the area of the potassium surface is 2 cm2?

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