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JEE Main 2009 (AIEEE) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from JEE Main 2009 (AIEEE)

Q159JEE Main 2009 · AIEEEEasy

Photoelectric Effect: Einstein's Equation

The surface of a metal is illuminated with the light of $400\text{ nm.}$ The kinetic energy of the ejected photoelectrons was found to be $1.68\text{ eV.}$ The work function of the metal is: $(hc = 1240\text{ eV.nm})$

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Answer: (a)

$E = \frac{1240}{400} = 3.1\text{ eV}$
$\phi = E - K_{max} = 3.10 - 1.68 = 1.42 \approx 1.41\text{ eV}$
So the answer is (a) $1.41\text{ eV}$ .

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