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Solution


Q.

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we incident a light of wavelength 550 nm on these two metal surfaces, then photo-electric effect is possible for the case of         [2025]
1 Li only  
2 Cs only  
3 Neither Cs nor Li  
4 Both Cs and Li  

Ans.

(2)

E (energy of incident photon) =1240550=2.25 eV

E>ϕCs, E<ϕLi

∴  Only cesium will show photoelectric effect.