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9th Class Science Sound Question Bank Sound Summative Objective Problems

  • question_answer
    A person is sitting 200 metres away from a 20 Hz sound source. What is the time interval at which successive compression pulses from the source reach him?

    A)  0.5 s                                     

    B)  0.05 s

    C)  0.005 s                                

    D)  0.0005 s

    Correct Answer: B

    Solution :

      We have \[f=20\text{ }Hz\] \[\therefore \]\[T=\frac{1}{f}=\frac{1}{20Hz}=0.05s\] \[\therefore \]Successive compression pulses reach the person after 0.05s.


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