| (i) Time taken between successive clapping is 0.1 s. |
| (ii) The distance between the man and the wall, after he stops clapping, if he hears one more echo is 33 m. |
| (iii) The distance between the man and the wall, after he stops clapping, if he hears four more echoes is 66 m. |
A) Only (i) and (ii) are correct.
B) Only (ii) and (iii) are correct.
C) Only (i) and (iii) are correct.
D) All (i), (ii) and (iii) are correct.
Correct Answer: C
Solution :
(i) Time taken between successive clapping\[=\frac{1}{10}s=0.1s\] (ii) Since one echo is heard, so the time taken between the last clap and its echo \[=\frac{1}{10}s\] Distance \[=330\times \frac{1}{10}\times \frac{1}{2}=16.5m\] (iii) Since four echoes are heard, the time taken between the last clap and the echo \[=4\times \frac{1}{10}=\frac{4}{10}s\] Distance \[=330\times \frac{1}{10}\times \frac{1}{2}=16.5m\]
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