SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A monochromatic light beam with a quantum energy of 9.0 eV is incident upon a photocell. The work function of the photocell is 4.1 eV. What is the maximum kinetic energy of the electron.
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4.2 eV
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4.4 eV
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4.7 eV
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4.9 eV
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Explanation:
Detailed explanation-1: -Solution. The work function of a metal is 4.2 Ev. Its threshold wavelength will be 2959 Å.
Detailed explanation-2: -Threshold wavelength =o=hc=6. 72×10−196. 63×10−34×3×108=2. 960×10−7m=2960Ao.
Detailed explanation-3: -Thus, the stopping potential is 2.012V .
There is 1 question to complete.