ICSE and ISC semester 1 exams to be held in November 2021 is postponed. New datesheet will be released later. It is now assumed that exam will be in offline mode.
Why is echo not heard in our living rooms? To hear echo, the minimum distance between the source and the reflector must be 17m. When this distance is more than 17m, the reflected sound can be distinguished from the original. As the length of our rooms is less than 17m, we don't hear echo.
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