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Homework Statement
The strobe lights on top of two tall radio towers both have a period of about 1.00 s. When turned on simultaneously, a keen observer notes that during an 813 s interval, the lights gradually fall out of synchronization and then come back into flashing synchronously. What is the interval ΔT between the periods of the two beacons?
Homework Equations
abs(frequency1-frequency2)=beat frequency
The Attempt at a Solution
it would appear that the two strobe lights have the same frequency, frequency=1/period=1 Hz...I don't know what to make of the 813 interval or what exactly delta-T refers to physically
I know the beat frequency involves the superimposition of these two light waves...