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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2000

  • question_answer
    A source X of unknown frequency produces 8 beats per second, with a source of 250 Hz and 12 beats per second with a source of 270 Hz. Then the frequency of the source X will be:

    A)  284 Hz                                 

    B)  265 Hz

    C)  258 Hz                                 

    D)  252 Hz

    Correct Answer: C

    Solution :

     Given: In first case number of beats per second =8 beats when frequency = 250 Hz In second case number of beats per second =12 beats when the frequency =270 Hz In the first case the unknown frequency  X is given by \[250\pm 8=258\]or \[242\,Hz\] Similarly, in second case, the unknown frequency X is given by \[270\pm 12=282\text{ }or\text{ }258\text{ }Hz\]             Therefore, the common value of frequency of the source will be 258 Hz.


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