When light with a frequency f1 = 547.5 thz illuminates a metal surface, the most energetic photoelectrons have 1.260 x 10^-19 j of kinetic energy. when light with a frequency f2 = 738.8 thz is used instead, the most energetic photo-electrons have 2.480 x 10^-19 j of kinetic energy
using these experimental results, determine the approximate value of planck's constant.
express your answer using four significant figures.
Answers: 3
.
we get 
and for 
we get 
, so we have:
by substracting the first equation to the second:
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