3 ms·
Use the construction the author is using, i.e. the emanating sound waves, but you'll have to start them where it all starts, i.e. at take-off, and not simply ap
by bernulli 4y ago
Use the construction the author is using, i.e. the emanating sound waves, but you'll have to start them where it all starts, i.e. at take-off, and not simply appearing right next to you. Then, correct the drawing by having the plane move slower than the sound waves. The first sound you should be hearing as observer will be the take-off (if you could hear it) at the airport, and the aircraft will be wherever it is afterwards.
- korantu 4y agoSuppose observer just woke up / heard plane that is passing overhead. Very reasonable assumption, as the plane might have taken off thousands of miles away, and will land thousands of miles away in the other direction. In this case, no point talking about takeoff sound, as it is not detectable already at these distances. Humans can detect reasonably well which direction the sound comes from. This direction will not match the direction they observe the airplane at. The article is describing the mismatch between plane real position and the plane position we would detect if we were just listening to it.
- krisoft 4y ago> you'll have to start them where it all starts, i.e. at take-off If we are nitpicking about minor details: the sound of a powered airplane doesn’t start at take-off but at engine start, often minutes before take-off.