2. Solved Papers
  3. CET Karnataka Engineering

CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2000

  • question_answer
    An echo is heard when the minimum distance of the reflecting surface is:

    A)  47 m                                    

    B)  34 m

    C)  17 m                                    

    D)  9 m

    Correct Answer: C

    Solution :

    Given: Velocity of sound in air \[\upsilon =340\,m/s\] Time for which the effect of sound remains on the human air is \[1/10\,th\]of the second. Hence, the minimum distance for echo hearing sound is given by \[s=\frac{1}{2}\times \upsilon \times \Delta t=\frac{1}{2}\times 340\times \frac{1}{10}=17m\]


You need to login to perform this action.
You will be redirected in 3 sec spinner