PUMPA - SMART LEARNING

எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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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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