- #1
Resmo112
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Homework Statement
the speed of waves on a lake depends on frequency. For waves of frequency 1.0 Hz the wave speed is 1.56 m/s; for 2.0 Hz waves the speed is .78 m/s. the 2.0 Hz waves reach you 120 seconds after the 1.0Hz waves generated by the same boat. How far away is the boat.
Homework Equations
we have 2 velocities and 2 frequencies the only equation I can find that includes both of those variables is
v=Lambda *f
The Attempt at a Solution
I'm studying for my final, I'd THINk you could just times the time by the velocity and that'd give you the distance between the the person and the boat. but the problem is it's the DIFFERENCE between 2 waves, that's confusing me, if you multiply 1.56 m/s * 120 s you end up with 187.2 which is really close to the actual answer which is 190m. any help would be greatly appreciated.