Reflection of Sound (Echo, Reverberation)Practice Questions & MCQs
Practice Reflection of Sound (Echo, Reverberation) questions from Sound (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Reflection of Sound (Echo, Reverberation)Quiz - Solve & Score
Q1. A trekker standing in a valley shouts towards a distant cliff and hears the echo come back after 2 s. If sound travels at 340 m/s in that air, how far is the cliff from the trekker?
- A.226.6667 m
- B.340 m
- C.680 m
- D.342 m
Answer: B. 340 m
The sound goes to the cliff and returns, so it covers 2d in time t. Total path = v*t = 340*2 = 680 m. This is the round trip, so d = (v*t)/2 = 680/2 = 340 m.
Q2. A boy claps his hands while facing a tall stone wall and the returning clap reaches him 3 s later. Taking the speed of sound as 344 m/s, what is his distance from the wall?
- A.344 m
- B.1032 m
- C.347 m
- D.516 m
Answer: D. 516 m
The sound goes to the wall and returns, so it covers 2d in time t. Total path = v*t = 344*3 = 1032 m. This is the round trip, so d = (v*t)/2 = 1032/2 = 516 m.
Q3. Standing in front of a mountainside, a shepherd yodels and the reflected sound returns after 1.6 s. With sound moving at 350 m/s, how far away is the mountainside?
- A.560 m
- B.186.6667 m
- C.280 m
- D.351.6 m
Answer: C. 280 m
The sound goes to the mountain and returns, so it covers 2d in time t. Total path = v*t = 350*1.6 = 560 m. This is the round trip, so d = (v*t)/2 = 560/2 = 280 m.
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