# Sound frequency heard by observer some distance from battery operated toy

A Battery-operated toy emites a signal at 1800Hz. It moves in a circle of a radius 1.2 m at 2.4 revolutions per seconds.

What are the minimium and maximum frequencies heard by a stationary observer some distance away in the plane of the circle?

Assume the speed of sound is 330 ms-1

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#### Solution Preview

The attached file contains the same contents as the plain text, but with MS Equation used for the fractions.

The main focus of this question is Doppler-shifting. As a sound (or any wave, for that matter) is played while the source is in motion relative to the observer, the frequency changes because the waves "pile up on each other" due to the source moving closer to the observer over every ...

#### Solution Summary

The minimum and maximum frequencies heard by a stationary observer some distance away in the plane of the circle are given. The solution explains the theory and applies it to solving the problems.