Answer:
The wavelength, frequency and speed of a photon are related as:
[tex]\lambda=\frac{c}{f}[/tex]
where, [tex]\lambda[/tex] is the wavelength, c is the speed of light because all photons travels with speed of light, c in space, and f is the frequency.
[tex]\Rightarrow\lambda=\frac{3\times10^8m/s}{1280\times 10^3s^{-1}}=234 m[/tex]
Hence, the wavelength of the radio photon is 234 m
Energy of this photon:
[tex]E=hf[/tex]
where, h is the Planck's constant.
[tex]E=6.6\times 10^{-34} Js\times 1280\times 10^3s^{-1}=8448 \times 10^{-31} J[/tex]
Hence, the energy of the radio photon is [tex]8448 \times 10^{-31} J[/tex]
