JEE Main 2019 Physics question
The magnetic field associated with a light wave is given, at the origin, by . If this light falls on a silver plate having a work function of 4.7 eV, what will be the maximum kinetic energy of the photo electrons? (c = ms, h = J-s)
Answer: (D)
Solution
Higher frequency Hz; hf ≈ 12.4 eV; ≈ 12.4 − 4.7 ≈ 7.7 eV.