The work function of Cesium (Cs) and Lithium (Li) metals are 1.9 eV and 2.5 eV, respectively. If we

The work function 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 ()1) Li only (2) Cs only (3) Neither Cs nor Li (4) Both Cs and Li
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