You do a photoelectric experiment. When you shine one frequency of the light on

Question

You do a photoelectric experiment. When you shine one frequency of the light on a metallic surface you find one value for the maximum kinetic energy of the photoelectrons. You change the frequency of the light and you find a different value for the maximum kinetic energy of photoelectrons. When light of a frequency 7.51771 × 1014 Hz is used the maximum kinetic energy is 2 × 1019 J. When light of a frequency 8.43045 × 1014 Hz is used the maximum kinetic energy is 2.4 × 1019 J. From your rough experiment, find a value for Planck’s constant. Hint: It is related to the slope. Answer in units of Js.

Explanation / Answer

m = y2-y1/x2-x1

m= (2.4*10-19 - 2*10-19)/(8.43045*1014 - 7.51771*1014)

= 4.38240*10-34

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