8th Class Science Sound Question Bank Sound IIT JEE Subjective Problems

  • 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

    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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