A spherical power source of 636 watts is 9.9 metres from a detector of area 3.6 cm2. If the signal is on the detector for 7.2 seconds, find the energy at the detector, in millijoules, with one digit of precision. Hint find the intensity of the wave at the detector first, then the power

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Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.