Apparent frequency of sound is \( 505 \mathrm{~Hz} \) when the listener is approaching a station....

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Apparent frequency of sound is \( 505 \mathrm{~Hz} \) when the listener is approaching a stationary source of sound with a velocity \( 1 \% \) of the velocity of sound in air. The actual frequency of sound is
(1) \( 470 \mathrm{~Hz} \)
(2) \( 480 \mathrm{~Hz} \)
(3) \( 490 \mathrm{~Hz} \)
(4) \( 500 \mathrm{~Hz} \)


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