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Unit - 7.1 Characteristics Of Sound — PHYSICS STD 8 — Question

ICSE BoardEnglish MediumSTD 8PHYSICSUnit - 7.1 Characteristics Of Sound1 Mark
Question
State two conditions for the formation of an echo?
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Answer

The necessary conditions for the formation of an echo:
The minimum distance between the source of sound and the reflecting body should be 17 meters.
The wavelength of sound should be less than the height of the reflecting body.

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