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Let us now pay attention to the oscillatory movements of the floaters. We observe that at certain intervals of time the floaters move with large amplitudes, which are given by the cosine part of the above formula. However, the rythme of their oscillatory movements is given by the sine part of the above formula. At other intervals of time they hardly move because the cosine part of the above formula is nearly equal to zero. Now, imagine that the floaters represent the ear drum of your ear and that the waves represent sound waves in the air which stem from two different sources with nearby frequencies. In the video at the next page you can hear such phenomenon caused by two tuning forks with slightly different frequencies. |