If a box is resting on the ground, its gravitational potential energy is
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The energy of a single photon is given by
where
is the Planck constant
f is the frequency of the wave (of the photon)
In our problem, the radio wave has a frequency of
, so if we put this value into the previous formula, we can find the energy of a single photon of this electromagnetic wave:
where
f is the frequency of the wave (of the photon)
In our problem, the radio wave has a frequency of