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JEE Main & Advanced Physics Wave Mechanics Question Bank Basics of Mechanical Waves

  • question_answer
    A man sets his watch by the sound of a siren placed at a distance 1 km away. If the velocity of sound is 330 m/s [JIPMER 1999]

    A)            His watch is set 3 sec. faster

    B)            His watch is set 3 sec. slower

    C)            His watch is set correctly

    D)            None of the above

    Correct Answer: B

    Solution :

                \[\text{Time}=\frac{\text{Distance }}{\text{Velocity}}=\frac{1000}{330}=3.03\]\[\sec \].                    Sound will be heard after 3.03 sec. So his watch is set 3sec, slower.


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