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CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    The diffraction of a crystal of barium with X-rays of wavelength 2.29 \[\overset{\text{o}}{\mathop{\text{A}}}\,\] gave a first order reflection at\[27{}^\circ 8\]. What is the distance between the diffracting planes? [sin\[27{}^\circ 8\] = 0.4561]

    A)  1.46 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]                           

    B)  1.59 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    C)  2.51 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]                           

    D)  5.46 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]

    Correct Answer: C

    Solution :

                    \[\because \]     \[n\lambda =2d\,\sin \theta \] \[1\times 2.29=2\times d\times 0.4561\] \[d=2.51\,\overset{\text{o}}{\mathop{\text{A}}}\,\]


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