What is the frequency of a radio wave with an energy of 4.644 × 10−24 J/photon? Answer in units of Hz.

E=hv, where E=energy in Joules, h=Planck's constant, v=Frequency in Herz.

4.644 × 10^−24 = 6.63 x 10^-34 x v

v =(4.644 × 10^−24) / (6.63 x 10^-34)

v = ~7.00 x 10^9 Hz - frequency of the radio wave.