In Which One of the Following Locations Can a Person Hear the Echo of a Sound?

Answer

There are many locations that a person can hear the echo of a sound. A person can hear the echo of a sound in a cave, in an empty room, and even when standing in an alley. You can even hear the echo of footsteps of someone following you if you listen carefully.
Q&A Related to "In Which One of the Following Locations Can..."
the answer is c. at least 16.6 meters in front of the reflecting surface!
http://wiki.answers.com/Q/In_which_of_the_followin...
Technically speaking, the echo is always there, but not necessarily detectable by human ears. You would need to take the speed of sound, roughly 345 m/s in 21 degree Celcius and figure
http://answers.yahoo.com/question/index?qid=200607...
Echo Cliff Problem. Echolocation? I kinda just need the formula for this problem, and Ill be able to figure it out. The question is: A person stands in front a cliff and gives a shout
http://www.helpfulbox.com/ans/Mathematics_Science/...
18) "C" - You have to be IN FRONT of the reflecting surface. "A" won't work, as it is too close for an echo. 19) "C" - Longitudinal wave. Rarefaction
http://answers.yahoo.com/question/index?qid=200702...
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