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	Is it true that sound travels further in cold weather than in warm weather and how does this work? Nick in Arizona
	The speed of sound does depend on temperature and it is slower at colder temperatures, so it can sound different. Deep down, sound is the vibration of molecules and if you've got a lower temperature and you meet them, they just vibrate a bit slower.
	October 2006

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Listen to this as part of the show: 22nd Oct 2006 - How We Hear, Echolocation and Giant Whoopee Cushions
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