a) The frequency of the photon is 
b) The wavelength of the photon is 
c) The wavelength of the photon is about 100 times larger than the nuclear radius
Explanation:
a)
The energy of a photon is given by
(1)
where:
is the Planck constant
f is the frequency of the photon
The photon in this problem has an energy of

And keeping in mind that

we can convert to Joules:

And now we can use eq.(1) to find the frequency of the photon:

b)
The wavelength of a photon is related to its frequency by the equation

where
is the speed of light
f is the frequency
is the wavelength
For the photon in this problem,

Re-arranging the equation, we find its wavelength:

c)
The size of the nuclear radius is approximately

While we see that the wavelength of this photon is

Therefore, the ratio between the wavelength of the photon and the nuclear radius is

So, the wavelength of the photon is approximately a factor 100 times larger than the nuclear radius.
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