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Different situation in Apparent Frequency #8211; (i) If source is moving towards listener but listener is at rest, then v<sub>s</sub> is positive and v<sub>o</sub> ∴ f = v/v #8211; v<sub>s</sub> times; f, i.e. f gt; f (ii) If source is moving away from listener but listener is at rest, then v<sub>s</sub> is negative and v<sub>o</sub> = 0. ∴ f = [v/v #8211; (-v<sub>s</sub>) times; f = (v/v + v<sub>s</sub>) times; f i.e. f lt; f (iii) If source is at rest and listener is moving away from source, then v<sub>s</sub> = 0 and v<sub>o</sub> is position. ∴ f = (v #8211; v<sub>o</sub>/v) times; f i.e. f lt; f
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