Homework Answers
4)
In visible light, violet has highest energy because its wavelength is lowest.
Red has least energy because its wavelength is highest.
Answer: Violet
5)
Given:
Energy of 1 mol = 5.2*10^2 KJ/mol
= 5.2*10^5 J/mol
Find energy of 1 photon first
Energy of 1 photon = energy of 1 mol/Avogadro's number
= 5.2*10^5/(6.022*10^23)
= 8.635*10^-19 J
This is energy of 1 photon
Given:
E = 8.635*10^-19 J
use:
E = h*f
8.635*10^-19 J =(6.626*10^-34 J.s)*f
f = 1.303*10^15 Hz
Answer: 1.30*10^15 Hz
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