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The stopping potential V 0 (in volt) as a function of frequency ( ν ) for a sodium emitter, is shown in the figure. The work function of sodium, from the data plotted in the figure, will be: (Given: Planck’s constant (h) = 6.63 × 10 –34 Js, electron charges e = 1.6 × 10 –19 C) 2 4 6 8 10 1.0 2.0 3.0 V 0 ν (10 14 Hz)

1. 1.95 eV
2. 2.12 eV
3. 1.82 eV
4. 1.66 eV

Correct answer: 1.66 eV

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