The frequency of the emitted radio waves is:
[tex]f=764 kHz = 7.64 \cdot 10^5 Hz[/tex]
The energy of a photon is given by:
[tex]E=hf[/tex]
where h is the Planck constant and f is the photon frequency. Using the frequency given by the problem, we can find the energy of each photon of this radiation:
[tex]E=hf=(6.6 \cdot 10^{-34} Js)(7.64 \cdot 10^5 Hz)=5.04 \cdot 10^{-28} J=5.04 \cdot 10^{-31} kJ[/tex]
