The work functions of cesium (Cs) and lithium (Li) metals are 1.9...

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

Options

ABoth Cs and Li
BNeither Cs nor Li
CCs only
DLi only

Correct answer

C. Cs only

Step-by-step solution

(E=\frac{1240 \mathrm{eV} \cdot \mathrm{~nm}}{550 \mathrm{~nm}}=2.25 \mathrm{eV}) Possible for

C_s

as (E > \phi_{c s}) Not for Li as (E < \phi_{L i})

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