Sonar Is Used to Determine the Speed of an Object

question 67

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

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