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We are discussing mechanical waves (sound) and some students feel
(understandably at first) that the harder (faster) one 'hits' air
molecules, the faster the disturbance will travel through the air. They
are thinking that the air molecules are particles that simply move
faster when hit harder thus making the disturbance move faster..
What metaphor and explanation might help them to see that the medium
dictates the velocity regardless of the 'hit'.