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24. Multiple choice question XXIV

1. For hearing an echo the minimum distance should be:

less than \(10\ m\)
between \(10\ m\) and \(15\ m\)
\(17\ m\) or more
none of the above

2. An echo is heard only, if the original sound after reflection should reach the ear in:

less than \(\frac{1}{100}\ s\)
less than \(\frac{1}{10}\ s\)
more than \(\frac{1}{10}\ s\)
none of the above

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