Practice

Questions

Pick a topic and practice with clear explanations.

Engineering

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV1.9 \text{ eV} and 2.5 eV2.5 \text{ eV}, respectively. If we incident a light of wavelength 550 nm550 \text{ nm} on these two metal surface, then photo-electric effect is possible for the case of