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JEE Main & Advanced Physics Wave Mechanics Question Bank Self Evaluation Test - Waves

  • question_answer
    An earthquake generates both transverse (5) and longitudinal (P) sound waves in the earth. The speed of S waves in about 4.5 km/s and that of waves is about 8.0 km/s. A seismograph records P and S waves from an earthquake. The first P wave arrives 4.0 min. before the first 5'wave. The epicenter of the earthquake is located at a distance about           

    A)  25 km

    B)  250 km

    C) 2500 km

    D) 5000 km

    Correct Answer: C

    Solution :

    [c] If x be the distance of epicentre from the seismograph, then \[\frac{x}{{{v}_{s}}}-\frac{x}{{{v}_{p}}}=4\times 60\] or \[\frac{x}{4.5}-\frac{x}{8}=4\times 60\] on simplifying, we get \[\,x=2500\text{ }km\]


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