The maximum kinetic energy Kmaxof photo-electrons emitted in a photoelectric cell is measured using lights of various frequencies v,. The slope of the graph is equal to

# The maximum kinetic energy $\left({\mathrm{K}}_{max}\right)$of photo-electrons emitted in a photoelectric cell is measured using lights of various frequencies v,. The slope of the graph is equal to

1. A

charge on an electron

2. B

work-function of emitter

3. C

velocity of photon

4. D

Planck's constant

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