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Please help I have been stuck on these homework question for a long time!! a) An echo is created when a sound reflects off of

Please help I have been stuck on these homework question for a long time!!

a)

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An echo is created when a sound reflects off of a surface and returns to the source. A person yells across a canyon and hears the echo 2.40 seconds later. If the air temperature is 25.0 deg C, how wide was the canyon?The speed of sound is measured to be 346.55 m/s. What is the current air temperature

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