Doppler Effect

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1.
A source moves toward a stationary observer at $v/10$ ($v$ = speed of sound). The apparent frequency is:
2.
An observer moves away from a stationary source at $v/5$. The apparent frequency is:
3.
A car horn emits 400 Hz. The car moves away at 30 m/s ($v = 330$ m/s). An observer hears:
4.
Both source and observer move toward each other at 17 m/s each ($v = 340$ m/s, $f = 500$ Hz). Apparent frequency:
5.
A source emitting 500 Hz moves toward a stationary observer at 34 m/s ($v = 340$ m/s). The apparent frequency is:

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