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Dual Nature of Radiation and Matter

12th Physics - Dual Nature of Radiation and Matter Model Question Paper

Dual Nature of Radiation and Matter Model Question Paper

12th Standard

    Reg.No. :
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Physics

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 1 = 5

  1. In an electron microscope, the electrons are accelerated by a voltage of 14 kV. If the voltage is changed to 224 kV, then the de Broglie wavelength associated with the electrons would _____.

    (a)

    increase by 2 times

    (b)

    decrease by 2 times

    (c)

    decrease by 4 times

    (d)

    increase by 4 times

  2. In photoelectric emission, a radiation whose frequency is 4 times threshold frequency of a certain metal is incident on the metal. Then the maximum possible velocity of the emitted electron will be _____.

    (a)

    \(\sqrt { \frac { { hv }_{ o } }{ m } } \)

    (b)

    \(\sqrt { \frac { { 6hv }_{ o } }{ m } } \)

    (c)

    \(2\sqrt { \frac { { hv }_{ o } }{ m } } \)

    (d)

    \(\sqrt { \frac { { hv }_{ o } }{2m } } \)

  3. The threshold wavelength for a metal surface whose photoelectric work function is 3.313 eV is _____.

    (a)

    4125 \(\mathring { A } \)

    (b)

    3750\(\mathring { A } \)

    (c)

    6000\(\mathring { A } \)

    (d)

    2062.5\(\mathring { A } \)

  4. The work functions for metals A, B and C are 1.92 eV, 2.0 eV and 5.0 eV respectively. The metal/metals which will emit photoelectrons for a radiation of wavelength 4100 Å is/are _____.

    (a)

    A only

    (b)

    both A and B

    (c)

    all these metals

    (d)

    none

  5. Light of wavelength falls on a metal having work function \(\frac { { h }_{ c } }{ { \lambda }_{ 0 } } \). Photo electric effect will place only if __________.

    (a)

    λ ≥ λ0

    (b)

    λ ≥ 2λ0

    (c)

    λ ≤ λ0

    (d)

    λ < λ0/2

    6. 5 x 2 = 10

  6. How does photocurrent vary with the intensity of the incident light?

  7. What is a photo cell? Mention the different types of photocells.

  8. An electron and an alpha particle have same kinetic energy. How are the de Broglie wavelengths associated with them related?

  9. What is photo voltaic cell?

  10. What is photo conductive cell?

    11. 5 x 3 = 15

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

  12. Give the construction and working of photo emissive cell.

  13. A proton and an electron have same velocity. Which one has greater de Broglie wavelength and why?

  14. Show the variation of photocurrent with collector plate potential for different frequencies but same intensity of incident radiation.

  15. The frequency V of incident radiation is greater than threshold frequency (vo) in a photocell. How will the stopping potential vary if frequency (v) is increased, keeping other factors constant?

    16. 2 x 5 = 10

  16. What should be the velocity of the electron so that its momentum equals that of 4000 Å wavelength photon.

  17. Write a note on continuous x-ray spectra.

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