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JEE Main 2024 (30 Jan, Shift 1) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from JEE Main 2024 (30 Jan, Shift 1)

Q49JEE Main 2024 · 30 JAN · SHIFT 1Easy

Photoelectric Effect: Einstein's Equation

The work function of a substance is $3.0\text{ eV}$ . The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately;

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Answer: (c)

Longest wavelength = threshold: $\lambda_0 = \dfrac{hc}{\phi} = \dfrac{1242\text{ eV nm}}{3.0\text{ eV}}$
$\lambda_0 \approx 414\text{ nm}$
So the answer is (c) 414 nm.

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