Electronic Devices and Circuits - ECE Questions and Answers

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As per Einstein's equation, the velocity of emitted electron in photoelectric emission is given by the equation

mv² = hf - U_w

mv² ≤ hf - U_w

mv² = hf + U_w

mv² ≤ hf + U_w

Answer : Option B

Explanation :

Some electrons have less energy than Fermi level E and, therefore, more energy than U_w to escape.

Therefore, this equation has inequality sign.

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