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NEET 2014 (AIPMT) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2014 (AIPMT)

Q148NEET 2014 · AIPMTMedium

Photoelectric Effect: Einstein's Equation

When the energy of the incident radiation is increased nby 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is

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Answer: (b)

$E = K + \phi$ : $E = 0.5 + \phi$ and $1.2E = 0.8 + \phi$ .
$0.6 + 1.2\phi = 0.8 + \phi \Rightarrow 0.2\phi = 0.2$
So the answer is (b) $\phi = 1.0$ eV.

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