v = 3.6 furlongs / light year
d = 0.45 furlongs
so
T = period = 0.45 / 3.6 = 0.125 light years
f = 1/T = 8 waves / light year
If you are studying Physics, use units.
The distance between two successive crest of a water wave travelling at 3.6 is 0.45. Calculate the frequency of the wave
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