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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    The radius of fourth zone at observation point present at a distance of 4 m from the plane wave front of wavelength 6400\[\overset{o}{\mathop{\text{A}}}\,\] is

    A)  \[32\times {{10}^{-4}}\]      

    B)  \[32\times {{10}^{-4}}cm\]

    C)  \[32\times {{10}^{-4}}mm\]     

    D)  \[16\times {{10}^{-2}}m\]

    Correct Answer: A

    Solution :

     \[{{r}_{4}}=\sqrt{bn\lambda }\] \[=\sqrt{4\times 4\times 6400\times {{10}^{-10}}}\] \[=32\times {{10}^{-4}}m\]


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