Approaching moving-source Doppler frequency
A sound source in a ultrasound calibration moves toward a stationary observer at \(13\,\text{m s}^{-1}\). The emitted frequency is \(675\,\text{Hz}\) and sound speed is \(340\,\text{m s}^{-1}\). Calculate the observed frequency. Use the diagram labels before calculating the requested value. Enter the numerical result and choose the interpretation that matches the wave physics.
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