Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Physics Dual Nature: Photon and Matter Waves The Photoelectric Effect
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 surface, 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