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Q.

A graph is drawn between stopping potential (y-axis) and incident frequency (x-axis). The intercept OA on x-axis gives 0.5 × 10¹⁵ Hz. The K.E. of photo electron emitted from the metal when the energy of the incident photon is 5 eV is,

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a

6 eV

b

7 eV

c

1.5 eV

d

3 eV

answer is B.

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Detailed Solution

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Threshold frequency is 0.5 × 10¹⁵ Hz

Energy of photon = $hν = \frac{6.6 \times 10^{- 34} \times 0.5 \times 10^{15}}{1.6 \times 10^{- 19}} = 2.06 eV$

$Maximum Kinetic energy of electron = 5 - 2.06 \approx 3 eV$

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A graph is drawn between stopping potential (y-axis) and incident frequency (x-axis). The intercept OA on x-axis gives 0.5 × 1015 Hz. The K.E. of photo electron emitted from the metal when the energy of the incident photon is 5 eV is,