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प्रश्न
At 20°C, the minimum distance of a person from a sound reflecting surface to hear an echo is :
विकल्प
12.2 m
17.2 m
15.2 m
34.4 m
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उत्तर
At room temperature, the minimum distance for echo is 17.2 m.
(b) 17.2 m.
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