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 $h = 6.62 \times 10^{- 34} J.s$ )

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Threshold Energy = hv = 6 .62 × 10 − 34 × 5 .5 × 10 14 J Work friction = 6 .62 × 5 .5 × 10 − 20 1 .6 × 10 − 19 eV = 2 .27 eV

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