| Column I | Column II |
| (1) The minimum distance between man & wall to listen the echo is | (A) echo |
| (2) SONAR works based on the principle | (B) 0.1 sec |
| (3) Persistence of hearing of human ear | (C) 17 m |
| (4) Reflection of sound | (D) Reverberation |
Answer:
(a) Distance travelled by the sound in going an coming back after reflection from the wall \[=2\times 112m=224\text{ }m\] \[Time=0.7\text{ }s\] \[2d=v\times t\] \[\Rightarrow \]\[224=v\times t\] \[\Rightarrow \] \[224=v\times 0.7\] \[\Rightarrow \] \[V=\frac{224}{0.7}m/s=320\text{ }m/s\]
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