4.92
×
10
14
H
z
Explanation:
Let's use the equation for the energy of a photon:
E
=
h
v
E represents the energy of the photon and it has units of Joules (J)
h represents Planck's constant and it has a value of
6.626
×
10
−
34
J
×
s
v is the frequency and it has units of Hz or
s
−
1
We know the energy of the photon, and Planck's constant doesn't change so all we have to do is solve for v like this:
E
h
=
v
v
=
3.26
×
10
−
19
J
6.626
×
10
−
34
J
×
s
v
=
4.92
×
10
14
H
z
