For the production of an echo, the reflecting surface should be :

rigid

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soft

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very near

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none of these

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Solution

The correct option is B rigid
For the production of an echo, the reflecting surface or the obstacle should be rigid such as building, hill, cliff etc.

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For the production of an echo, the reflecting surface should be :

The correct option is B rigidFor the production of an echo, the reflecting surface or the obstacle should be rigid such as building, hill, cliff etc.

The correct option is B rigid
For the production of an echo, the reflecting surface or the obstacle should be rigid such as building, hill, cliff etc.