(Answered) A stone tossed into a body of water creates a disturbance

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A stone tossed into a body of water creates a disturbance at the point of impact that l for t4.0s. Measurements indicates that the wave speed is v 25 cm/s.

(a) Over what distance on the surface of water does the wave group extend?

(b) An observer counts 12 wave crests in the group. Use the classical uncertainty relationship to estimate the precision with which the wavelength could be determined

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