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Medical
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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be:

  • Option 1)

    2.4 V

  • Option 2)

    -1.2 V

  • Option 3)

    -2.4 V

  • Option 4)

    1.2 V

 
As we discussed in concept Conservation of energy -   - wherein     Stopping Potential /Cut-off Potential - It is defined as the potential necessary to stop any electron from reaching the other side. -           Option 1) 2.4 V This option is incorrect. Option 2) -1.2 V This option is incorrect. Option 3) -2.4 V This option is incorrect. Option 4) 1.2 V This option is correct.
Medical
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A source S_{1} is producing, 10^{15} photons per second of wavelength 5000 A^{\circ}. Another source S_{2} is producing 1.02\times 10^{15} photons per second of wavelength 5100 A^{\circ} Then, (power of S_{2}) (power of S_{1}) is equal to:

  • Option 1)

    1.00

  • Option 2)

    1.02

  • Option 3)

    1.04

  • Option 4)

    0.98

 
As we discussed in concept photon - A packet or bundle of energy is called a photon -    and Energy of a photon - - wherein    Power =        Option 1) 1.00 This option is correct. Option 2) 1.02 This option is incorrect. Option 3) 1.04 This option is incorrect. Option 4) 0.98 This option is incorrect.
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