A) Decibel
B) Closed pipe
C) Echo
D) Timbre
Answer: C
Explanation: Echo refers to a distinct reflection of sound heard after the original. It can be used to estimate distance.
A) Decibel
B) Closed pipe
C) Echo
D) Timbre
Answer: C
Explanation: Echo refers to a distinct reflection of sound heard after the original. It can be used to estimate distance.
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