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JEE Main & Advanced JEE Main Paper (Held On 12 May 2012)

  • question_answer
    This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement 1: Bats emitting ultrasonic waves can detect the location of a prey by hearing the waves reflected from it. Statement 2: When the source and the detector are moving, the frequency of reflected waves is changed.   JEE Main Online Paper (Held On 12 May 2012)

    A) Statement 1 is false. Statement 2 is true.

    B)                        Statement 1 is true, Statement 2 is false.

    C)                        Statement 1 is true. Statement 2 is true, Statement 2 is not the correct explanation of Statement 1. 

    D)                        Statement 1 is true. Statement 2 is true, Statement 2 is the correct explanation of Statement 1.

    Correct Answer: C

    Solution :

                    Bats catch the prey by hearing reflected ultrasonic waves. When the source and the detector (observer) are moving, frequency of reflected waves change. This is according to Doppler's effect.                   


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