A Stationary Railroad Whistle Is Sounded

question 39

Multiple Choice

A stationary railroad whistle is sounded. An echo is heard 5.0 seconds later by the train's engineer. If the speed of sound is 343 m/s, how far away is the reflecting surface?

• A)68 m
• B)140 m
• C)860 m
• D)1700 m
• E)2000 m

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