Class 12 NEET Physics Dual Nature of Matter and Radiation

If ϕ is the work function of photosensitive material in eV and light of wavelength of numerical value λ=‌

hc

e

metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take h-Plank's constant, c-velocity of light in free space) is (in SI units):