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JEE Main & Advanced JEE Main Paper (Held on 10-4-2019 Afternoon)

  • question_answer
    The correct figure that shows, schematically, the wave pattern produced by superposition of two waves of frequencies 9 Hz and 11 Hz is : [JEE Main 10-4-2019 Afternoon]

    A)

    B)

    C)            

    D)

    Correct Answer: D

    Solution :

    \[{{f}_{beat}}=11-9=2Hz\] \[\therefore \]Time period of oscillation of amplitude \[=\frac{1}{{{f}_{beat}}}=\frac{1}{2}Hz\] Although the graph of oscillation is not given, the equation of envelope is given by option


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