The displacement from the position of equilibrium of a point 4 cm from a source of sinusoidal oscillations is half the amplitude at moment t = T/6 (T is the time period). Assume that the source was at mean position at t = 0. The wavelength of the running wave is
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Question

The displacement from the position of equilibrium of a point 4 cm from a source of sinusoidal oscillations is half the amplitude at moment t = T/6 (T is the time period). Assume that the source was at mean position at t = 0. The wavelength of the running wave is

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G1 Physics · Accepted Answer

Step 1: For sound, f' = f(v ± vₒ)/(v ∓ vₛ), with velocities taken relative to the medium. Step 2: Choose signs for approach/recession; for an echo/reflection apply the Doppler shift twice. Step 3: If two frequencies are heard, take their difference for beats. Final: B: 0.48 m.