Posted by **susan** on Thursday, December 1, 2011 at 6:44pm.

Help me with this problem i do not get it?

A light wave can travel the earth to the moon in 1.3 s. the distance to the moon is 384,790 km. how long would it take a sound wave to travel the same distance at 343 m/s? state you answer in days. I got 2 days but i really think its wrong so please help

- physics -
**drwls**, Thursday, December 1, 2011 at 6:53pm
That is a stupid question, but the problem is apparently due to the teacher. Sound waves cannot reach the moon, at any speed. They require a fluid to go through. There is vacuum between the Earth and Moon.

If sound waves could reach the moon at that speed, the time required would be (384,790,000/343) = 1.12*10^6 s = 13 days

- physics -
**susan**, Thursday, December 1, 2011 at 7:13pm
thank u drwls

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