• question_answer Match the following: 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

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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