Question 165 of 200

Given figure shows few data points in a photo-electric effect experiment for a certain metal. The minimum energy for ejection of electrons from its surface is: (Planck's constant $h=6.62\times {10}^{–34}\text{J.s}$)

A$2.27\text{eV}$B$2.59\text{eV}$C$1.93\text{eV}$D$2.10\text{eV}$

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Answer: (A) $2.27\text{eV}$

Threshold Energy $=hv$
$=6.62\times {10}^{-34}\times 5.5\times {10}^{14} J$
Work friction $=\dfrac{6.62\times 5.5\times {10}^{-20}}{1.6\times {10}^{-19}}eV$
$=2.27 eV$