JEE Main & Advanced Physics Wave Mechanics Question Bank Graphical Questions

  • question_answer
    Two pulses in a stretched string whose centres are initially 8 cm apart are moving towards each other as shown in the figure. The speed of each pulse is 2 cm/s. After 2 seconds, the total energy of the pulses will be [IIT-JEE (Screening) 2001]

    A)             Zero

    B)             Purely kinetic

    C)             Purely potential

    D)             Partly kinetic and partly potential

    Correct Answer: B

    Solution :

                After 2 sec the pulses will overlap completely. The string becomes straight and therefore does not have any potential energy and its entire energy must be kinetic.


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