Sonar Is Used to Determine the Speed of an Object

question 43

Multiple Choice

Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?

• A) 347 m/s
• B) 331 m/s
• C) 8.4 m/s
• D) 6.9 m/s

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