Question

Which equation was used by Albert Einstein to explain the photoelectric effect? [E = energy, h = Planck’s constant, and v = frequency.]
E = mc005-1.jpg
E = hv
E = mc005-2.jpg
E = h - v

Answer 1

E = hν

Einstein proposed that light comes in quanta (photons) with energy E = hν. For the photoelectric effect the maximum kinetic energy of emitted electrons is K_max = hν − φ, where φ is the material's work function and ν the frequency.