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AP Physics 2
14.2 Periodic Waves
14.1 Properties of Wave Pulses and Waves
BeginnerMCQProportional AnalysisConceptual23.7k
A rectangular diagram divided vertically into two regions by a dashed line. The left region is labeled Warm Air with wave speed v_0. Inside the left region, a sinusoidal wave with wavelength \lambda_0 travels to the right toward the boundary, indicated by a horizontal arrow labeled Sound Wave. The right region is labeled Cold Air with wave speed v_0 / 2 and contains no drawn wave. No other labels, lines, text, or axes appear.
Sound wave moving from warm air into cold air.
A sound wave with frequency \(f_0\) and wavelength \(\lambda_0\) travels through warm air where its speed is \(v_0\). The wave then crosses a boundary into a region of cold air where its speed decreases to \(\dfrac{1}{2}v_0\). What are the frequency and wavelength of the sound wave in the cold air?

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