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# Clarissa is standing at the bottom of a canyon, shouting at a canyon wall that is 4360 feet away. How long will it take for the sound to come back to her as an echo?

Question #77770. Asked by Tank42. (Mar 24 07 2:48 PM)

tragic_flawed

Will the echo come back!? I don't think so...but if it did around 11.3 seconds?

 Mar 24 07, 3:23 PM
Baloo55th

You've never met Clarissa.....

 Mar 24 07, 3:47 PM
Marxious

Approximately 5 seconds.

 Mar 24 07, 5:21 PM
What-A-Mess

"At sea level, at a temperature of 21 °C (70 °F) and under normal atmospheric conditions, the speed of sound is 344 m/s (769.5 mph or 1238 km/h or 979 ft/sec)."

Elevation, temperature and humidity WILL change the speed of sound through air.

Knowing this......The distance of 4360 feet times 2 (there and back) divided 979 = 8.9070 seconds

 Mar 24 07, 6:48 PM

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 There are 3 soldiers and 3 prisoners who need to cross a canyon. Their flying-fox only holds 2 people. On the far side of the canyon is a small prison which the prisoners can put into as they arrive. How can they cross the canyon successfully?

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