NEET Sample Paper NEET Sample Test Paper-9

  • question_answer Two waves are represented by the following equations \[{{Y}_{1}}=5\sin \,\,2\pi \,(10t-0.1X),\] \[{{Y}_{2}}=10\sin \,2\pi \]\[(20t-0.2X)\]. Ratio of intensities \[{{l}_{2}}/{{l}_{1}}\] will be:

    A)  1                    

    B)  2

    C)  4                    

    D)  16

    Correct Answer: D

    Solution :

    The required ratio \[\frac{{{l}_{2}}}{{{l}_{1}}}=\frac{F_{2}^{2}A_{2}^{2}{{V}_{2}}}{F_{1}^{2}A_{1}^{2}{{V}_{1}}}\] \[=\frac{400\times 100\times 100}{100\times 25\times 100}=16\]

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