frequency f = 3.09 X 1014 /sec
h = 6.67 X 10-34 J.s
a )
the minimum energy is E
E = h f
E = 6.67 X 10-34 X 3.09 X 1014
E = 20.163 X 10-20 J
E = 2.0163 X 10-19 J or
E = 2.0163 X 10-19 / 1.6 X 10-19
E = 1.26 eV
b )
= 225 nm
= 225 X 10-9 m
we have f = c /
f = 3 X 108 / 225 X 10-9
f = 1.33 X 1015 /sec
E = h f
E = 6.67 X 10-34 X 1.33 X 1015
E = 8.89 X 10-19 J
or
E = 8.89 X 10-19 / 1.6 X 10-19
E = 5.55 eV
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