Use the equation from week 3:

f

r

e

q

u

e

n

c

y

=

w

a

v

e

s

p

e

e

d

w

a

v

e

l

e

n

g

t

h

and the wavelength you found in #3 to calculate the frequency of this photon (remember the speed of light is 3E8 m/s) :

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