During courtship displays, male hummingbirds make dramatic dives accompanied by

Question

During courtship displays, male hummingbirds make dramatic dives accompanied by unique sounds that they make from a peculiar resonance effect of specialized tail feathers: http://www. Sciencemag.org/news/2011/09/dive-bombing-hummingbirds-let-their-feathers-do-talking Male Anna's hummingbird tail feathers resonate at peak amplitude right at 4, 000 Hz. a) After watching their high speed dives, you wonder just how fast they dive. Knowing they make that sound in their dive, you position yourself directly beneath one as it dives and record its sound. Upon analyzing the recording you determine a frequency of 3630 Hz at peak amplitude in your recording. How fast did the bird dive toward you?

Explanation / Answer

The frequency at peak amplitude is 3630 Hz

Hence the time the bird took to dive T = 1/ frequency

T = 1/ 3630 sec

0.000275482094 sec

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