An airliner at take off has a sound power of approximately 5.0 x 10 'W. An airport operator is 30 meters away. Calculate: the intensity and the sound level perceived by the operator; the intensity and the sound level at a distance of 2000 m near a built-up area. Is the value found within the legal limits (<80 dB)?

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Answersystem;

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.