Q155 / 160 · TS EAMCET 2018 (05 May Shift 1) · Physics

A photon of energy $4 \mathrm{eV}$ imparts all its energy to an electron that leaves a metal surface with $1.1 \mathrm{eV}$ of kinetic energy. The work function of the metal is

Correct answer
A
$2.9 \mathrm{eV}$
B
$5.1 \mathrm{eV}$
C
$3.64 \mathrm{eV}$
D
$4.4 \mathrm{eV}$

Solution

Work function = Incident energy-K $\mathrm{E}$ of electron $=4 \mathrm{eV}-1.1 \mathrm{eV}=2.9 \mathrm{eV}$

Hence, the correct answer is option: 'A'.

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