GCSE Physics


"In space, no one can hear you scream"

If there is absolutely no matter in contact with the vibrating object, it cannot make anything else vibrate. You may well have been shown the famous bell jar experiment?

glass bell jar with electric bell ringing inside, inaudible when the air is pumped out

With the bell ringing continuously inside, it can be easily heard outside of the jar. Once a vacuum pump is turned on, the air is slowly removed. As this happens, the sound gets quieter until eventually it cannot be heard at all.

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