What is the maximum kinetic energy of an ejected electron if platinum metal is irradiated with...
What is the maximum kinetic energy of an ejected electron if platinum metal is irradiated with 166-nm light? The threshold wavelength for a platinum metal surface is 212 nm. Give your answer accurate to three significant figures. Use exponential notation (e.g. 1.23e-19).
Homework Answers
threshold energy = h*c/lambda0
= (6.626*10^-34 * 3*10^8)/(212*10^-9)
=9.3764*10^-19 J
Irradiated energy = h*c/lambda
= (6.626*10^-34 * 3*10^8)/(166*10^-9)
= 1.197*10^-18 J
maximim KE = 1.197*10^-18 J - 9.3764*10^-19 J
= 2.59*10^-19 J
Answer: 2.59*10^-19 J
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