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Q.

The work functions of Cesium (Cs), Potassium (K) and Sodium (Na) are 2.14eV, 2.30eV and 2.75eV respectively. If incident energy of 2.20eV, which of these photosensitive surfaces may emit photo electrons? 

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a

Both Na and K only

b

Na only

c

Cs only

d

K only

answer is B.

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Detailed Solution

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Incident photon should have an energy more than work function. 
So, only Cs has work function less than photon energy.

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The work functions of Cesium (Cs), Potassium (K) and Sodium (Na) are 2.14eV, 2.30eV and 2.75eV respectively. If incident energy of 2.20eV, which of these photosensitive surfaces may emit photo electrons?