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NEET 2005 (AIPMT) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2005 (AIPMT)

Q163NEET 2005 · AIPMTEasy

Photoelectric Effect: Einstein's Equation

The work functions for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein's equation the metals which will emit photoelectrons for a radiation of wavelength 4100 $\mathring{A}$ is/are

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Answer: (b)

Photon energy $E = \dfrac{12400\text{ eV Å}}{4100\text{ Å}} \approx 3.02\text{ eV}$
$3.02 > 1.92$ (A) and $> 2.0$ (B), but $< 5$ (C).
So the answer is (b) A and B only.

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