Final answer:
The wavelength of the γ-ray photon is approximately 8.28 x 10^-14 m.
Step-by-step explanation:
To find the wavelength of a γ-ray photon, we can use the equation:
λ = h/p
Where λ is the wavelength, h is Planck's constant (6.626 x 10-34 J.s), and p is the momentum of the photon.
Given that the momentum of the photon is 8.00 x 10-21 kg.m/s, we can substitute these values into the equation to find the wavelength:
λ = (6.626 x 10-34 J.s) / (8.00 x 10-21 kg.m/s)
λ = 8.28 x 10-14 m
Therefore, the wavelength of the γ-ray photon is approximately 8.28 x 10-14 m.