what do you mean by echo ? write the condition to have an echo? give me the answer
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The distance between the sound source and the place where it is reflected from must not be less than 17m and the period between hearing the original sound and its echo should not be less than 0.1 of a second.
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The distance between the sound source and the place where it is reflected from must not be less than 17m and the period between hearing the original sound and its echo should not be less than 0.1 of a second.
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