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 p

Question

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

TestHub · Accepted Answer

E = 550 nm 1240 eV ⋅ nm ​ = 2.25 eV Possible for C s ​ as E > ϕ cs ​ Not for Li as E < ϕ L i ​

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