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Falak786
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Asked: 2021-09-07T11:38:41+00:00 In:

The minimum distance between the obstacle to hear echo is:

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Poll Results

0%(a) 15 m.
0%(b) 16 m.
0%(c) 20 m.
100%(d) 17 m. ( 12 voters )
Based On 12 Votes

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    1 Answer

    1. (d) 17 m.

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