What is the threshold frequency (in s−1) for cobalt metal if a photon with frequency 1.32 ...
What is the threshold frequency (in s−1) for cobalt metal if a photon with frequency 1.32 ✕ 1015 s−1 ejects a photon with 7.18 ✕ 10−20 J kinetic energy?
Homework Answers
Energy of photon = plank constant * frequency
= 6.626*10^-34 * 1.32*10^15
= 8.74632*10^-19 joules
Total energy = threshold energy + kinetic energy
= 8.75*10^-19 - ( 7.18*10^-20) = KE
= 8.032*10^-19 Joules
Use again energy formula
= 8.032*10^-19 = 6.626*10^-34 * frequency
Frequency = 1.21*10^15 s-1
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