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

  • question_answer
    A man standing on a cliff claps his hand hears its echo after 1 sec. If sound is reflected from another mountain and velocity of sound in air is 340 m/sec. Then the distance between the man and reflection point is                [RPET 2000]

    A)            680 m                                      

    B)            340 m

    C)            85 m                                        

    D)            170 m

    Correct Answer: D

    Solution :

                If d is the distance between man and reflecting surface of sound then for hearing echo                    \[2d=v\times t\Rightarrow d=\frac{340\times 1}{2}=170\,m\]


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