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NEET 2010 (AIPMT, Prelims) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2010 (AIPMT, Prelims)

Q157NEET 2010 · AIPMT · PRELIMSEasy

Photoelectric Effect: Einstein's Equation

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

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Answer: (b)

$E = \frac{1240}{200} = 6.2\text{ eV}$
$K_{max} = 6.2 - 5.01 = 1.19 \approx 1.2\text{ eV}$ , so $|V_0| = 1.2\text{ V}$ .
The collector must be negative with respect to the plate to repel the electrons.
So the answer is (b) $-1.2$ V.

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