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the work function of caesium potassium and sodium

Q. The work function of caesium potassium and sodium are 2.14 eV, 2.30 eV and 2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV, which of these photosensitive surfaces may emit photoelectrons?

(1) Cs only

(2) Both Na and K

(3) K only

(4) Na only

                                                                                            (NEET-2023)

 

Aditya Bhatt Answered question 8 February 2024
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