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Dual Nature of ...

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  • Question 1
    4 / -1

    Maximum velocity of the photoelectrons emitted by a metal surface is 1.2 ×106 ms–1. Assuming the specific charge of the electron to be 1.8 × 1011 Ckg–1, the value of the stopping potential in volt will be

  • Question 2
    4 / -1

    The frequency of the incident light falling on a photosensitive metal plate is doubled, the kinetic energy of the emitted photoelectrons is

  • Question 3
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    Threshold wavelength for photoelectric effect on sodium is 5000 Å. Its work function is

  • Question 4
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    The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2 > W1). If the current before and after change are I1 and I2, all other conditions remaining unchanged, then (assuming hv > W2)

  • Question 5
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    A beam of light of wavelength λ and with illumination L falls on a clean surface of sodium. If N photoelectrons are emitted each with kinetic energy E, then

  • Question 6
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    Which is the incorrect statement of the following?

  • Question 7
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    When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then

  • Question 8
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    The photoelectric threshold wavelength of a certain metal is 3000 Å. If the radiation of 2000 Å is incident on the metal

  • Question 9
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    A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is

  • Question 10
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    The work functions for sodium and copper are 2 eV and 4 eV. Which of them is suitable for a photocell with 4000 Å light?

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