| Column I | Column II | ||
| (i) | The minimum distance between man & wall to | (a) | echo listen the echo is |
| (ii) | SONAR works based on the principle | (b) | 0.1 sec |
| (iii) | Persistence of hearing of human ear | (c) | 17 m |
| (iv) | Reflection of sound | (d) | Reverberation |
Answer:
Distance travelled by the sound in going and coming back after reflection from the wall \[=2\times 112m=224\text{ }m\] Time \[=0.7\text{ }s\] \[2d=v\times t\] \[\Rightarrow \]\[224=v\times t\] \[\Rightarrow \]\[224=v\times 0.7\]
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