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Physics Q. A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1320 Hz. The bird-watcher, however, hears a?
The bird-watcher, however, hears a frequency of 1410 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
If possible, please include units and workings. Will happily award a best answer.
1 Answer
- Randy PLv 73 years ago
The sound has changed by 90 Hz, or 90/1320 = 0.068 or about 7% of its original frequency.
So the bird is moving at 7% of the speed of sound.
(It's only an approximation that those two percentages are the same, but they are pretty close for things moving at small fractions of the speed of sound).