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9th Class Science Sound Question Bank Sound

  • question_answer
    A.R. Rehman is conducting a musical night in an open auditorium in New York. If a person who is sitting in the auditorium at a distance of 250 m from the stage and the other who is watching the live program on a television set sitting in front of it in Hyderabad, then the person who hear him first is the

    A) Person sitting in auditorium

    B) Person sitting in Hyderabad

    C) Both will hear at the time

    D) Cannot be said.

    Correct Answer: B

    Solution :

    Here, distance from stage = 250 m (given) Speed of sound \[\text{= 330 m }{{\text{s}}^{\text{-1}}}\] So, time taken by person sitting in the auditorium to hear him \[\text{=}\frac{250}{330}=\frac{25}{33}s\] While person sitting in front of T.V. will hear him instantly as electronic signals travel with speed of light.


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