What is the cause of the apparent change in frequency heard in the Doppler effect?, The change in the intensity (loudness), The change in the speed of the wave in the medium, The relative speed between the source and the observer, The distance between the source and the observer., When a stationary source emits sound and the observer moves directly toward it, the observed frequency, increase, decrease, stay the same, If a sound source moves toward a stationary observer, the wavelength (, Unchanged, but the wave speed increases, Shorter than the source wavelength, In the general Doppler equation what sign is used for the observer speed (vo ) if the observer moves away from the source?, negative , positive, In the general Doppler equation what sign is used for the source speed (vS ) if the source moves toward the observer, negative , positive, ‏ a car horn approaches a stationary observer, does the speed (v) of the sound waves traveling through the air change, No, the speed of sound is constant in a uniform medium (air), Yes, the speed increases because the source is moving, Yes, the speed decreases because the wavelength is compressed.

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