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SCIn this clip, musician Armin Küpper plays his saxophone near a giant pipeline in a construction area. What you hear after each note is an echo, a sound wave reflecting off the far end of the pipe and traveling back to him.
Sound travels at around 343 meters per second (1,235 km/h or 767 mph) through air. In this video, the echo takes about 1.5 seconds to return. That means the reflected sound traveled about 514.5 meters (1,688 feet) round-trip, so the end of the pipe is at around 257 meters (843 ft) away.
(This is my calculation, and it might not be 100% accurate. You can calculate it yourself and type the answer in the comments!)
An echo is a single, distinct reflection off a distant surface. Which is, for example, different from reverberation: a rapid series of echoes that blend together due to multiple reflections.
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💡 Learn More:
Measuring the speed of sound - Britannica
https://www.britannica.com/science/acoustics/Measuring-the-speed-of-sound
[Sources]
(🎞 @arminkuepper)
(🎼 Pipelinefunk – Armin Küpper)
(✍️ Description)
1. Kinsler, L.E. et al. (2000). Fundamentals of Acoustics.
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