Explanation:
The frequency of a wave is equal to:

where c is the speed of light, l is the wavelength of the wave. Replacing values:

The energy of the proton is:

where h is the Planck´s constant. Replacing

The number of photons is:

where E1 is the energy of the photon. Replacing:

Answer:
The number of photons is 4.8x10^14
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