A photon of 6eV is incident on a metal surface and the emitted electron is stopped by a retarding potential of −5eV. What is the work function of the metal?
A
1eV
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B
2.5eV
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C
3eV
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D
11eV
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Solution
The correct option is A1eV
Since, the electron is stopped by −5eV. Also, it is known that K.E=5eV