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

  • question_answer
    The minimum distance of reflector surface from the source for listening the echo of sound is [CPMT 1997; RPMT 1999; KCET 2000]

    A)            28 m                                        

    B)            18 m

    C)            19 m                                        

    D)            16.5 m

    Correct Answer: D

    Solution :

                \[2d=v\times t\], where \[v=\]velocity of sound = 332 \[m/s\]                    t = Persistence of hearing = \[\frac{1}{10}\sec \].                       Þ \[d=\frac{v\times t}{2}=\frac{332\times \frac{1}{10}}{2}=16.5\]\[m\]


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