A car makes sound as it moves toward a stationary observer. What best describes the sound wave heard by the observer compared with the sound heard by the car’s driver?

As the car moves toward the stationary observer, each new sound wave is emitted closer to the previous one in the direction of travel. This compresses the waves, making their wavelength shorter and their frequency higher for the observer. The driver moves with the car and does not hear this same Doppler shift.

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