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Halliday 2 Cap 18 - P18 069

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    December 2018

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69. (a) The period is the reciprocal of the frequency: T = 1/f = 1/(90 Hz) = 1.1 × 10−2 s. (b) Using v = 343 m/s, we find λ = v/f = 3.8 m.