An echo repeats two syllables. If the speed of sound is \( 330 \mathrm{~m} / \mathrm{s} \). Then....

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An echo repeats two syllables. If the speed of sound is \( 330 \mathrm{~m} / \mathrm{s} \). Then minimum distance of reflecting surface
\( \mathrm{P} \)
(1) \( 16.5 \mathrm{~m} \)
(2) \( 33.0 \mathrm{~m} \)
(3) \( 66.0 \mathrm{~m} \)
(4) \( 330 \mathrm{~m} \)


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