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Dual Nature of Radiation

Section: Physics

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Question : 8 of 24

Marks: +1, -0

In a photoelectric experiment a parallel beam of monochromatic light with power of 200W is incident on a perfectly absorbing cathode of work function

6.2\,\text{eV}

The frequency of light is just above the thres hold frequency so that the photoelectrons are emitted with negligible kinetic energy. Assume that the photoelectron emission efficiency is 100%. A potential difference of 500V is applied between the cathode and the anode. All the emitted electrons are incident normally on the anode and are absorbed. The anode experiences a force

F=n\times10^{-4}\,\text{N}

due to the impact of the electrons. The value of n is_______ . Mass of the electron

m_e=9\times10^{-31}\,\text{kg}

1.0\,\text{eV}=1.6\times10^{-19}\,\text{J}

[JEE Adv 2018 P2]

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