Ultrasonic,infrasonicand audible sound waves propagate through the same medium with speed V1,V2 and V3 respectively at constant temperature,the
A. V1= V2= V3
B. V1 is smaller than V3 is smaller than V2
C. V1 is greater than V3 is greater than V2
D. V1 is greater than V2 is greater than V3
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D v1 is greater than V2 and V2 is greater than v3
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