The maximum kinetic energy (Kmax) of photo-electrons emitted in a photoelectric cell is measured using lights of various frequencies n. The slope of the graph is equal to
Answer & explanation
Correct answer: option 4
hf = W0 + (K.E.)
or K.E. = Kmax = hf – W0
Comparing with y = mx + C, we find that Slope m = h (Planck’s constant)