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  4. Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surfface is: (Plancks constant . h =6.62 × 10-34 J . s )

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Q. Given figure shows few data points in a photo electric effect experiment for a certain metal. The minimum energy for ejection of electron from its surfface is : (Plancks constant $\left. h =6.62 \times 10^{-34} J . s \right)$Physics Question Image

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Solution:

Graph of $V _{ s }$ and $f$ given $( B\, 5.5,0)$
$h v=\phi+e V_{s}$
at B $V _{ s }=0, v=5.5$
$\Rightarrow \quad h \times 5.5 \times 10^{14}=\phi $
$\phi=\frac{6.62 \times 10^{-34} \times 5.5 \times 10^{14}}{1.6 \times 10^{-19}} eV$
$ =2.27 eV$