You Are Standing in the Very Center of a Deep,flat-Bottomed

question 53

Multiple Choice

You are standing in the very center of a deep,flat-bottomed valley,and shout "Hello!" If the speed of sound is 343 m/s,and you hear the second echo "Hello!" at 2.1 seconds after you shout,how wide is the valley?

• A)360 m
• B)180 m
• C)720 m
• D)540 m

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