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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.
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The volume control on a surround sound amplifier is adjusted so the sound intensity level at the listining position increase from 22 to 66 dB. What is the raiton of the final sound intensity to the original sound intensity?

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