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AMU Medical AMU Solved Paper-2012

  • question_answer
    Figure given shows a sinusoidal wave on a string. If the frequency of the wave is 150 Hz and the mass per unit length of the string is 0.2 g/m, the power transmitted by the wave is                                

    A)                  2.34 W 

    B)                  3.84 W

    C)                  4.80 W                

    D)                  5.78 W

    Correct Answer: A

    Solution :

                     Velocity, \[v=n\lambda \]                 \[v=150\times 0.06\]                 \[v=9\,m/s\]      Power, \[P=2{{\pi }^{2}}{{n}^{2}}{{a}^{2}}(m/l)\,v\] \[=2\times {{(3.14)}^{2}}\times {{(150)}^{2}}\times {{(0.6)}^{2}}\times 0.2\times {{10}^{-3}}\times 9\] \[=2.87\,W\]                     


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