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NEET Sample Paper NEET Sample Test Paper-92

  • question_answer
    Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000 K. Maximum intensity is emitted at a wavelength of about 4800 \[\overset{{}^\circ }{\mathop{A.}}\,\] If the sun were to cool down from 6000 K to 3000K, then the peak intensity would occur at a wavelength

    A) \[4800\overset{{}^\circ }{\mathop{A}}\,\]                     

    B) \[9600\overset{{}^\circ }{\mathop{A}}\,\]

    C) \[7200\overset{{}^\circ }{\mathop{A}}\,\]                     

    D) \[6400\overset{{}^\circ }{\mathop{A}}\,\]

    Correct Answer: B

    Solution :

    [b]  From Wien's displacement law, \[{{\lambda }_{\max }}T=\] constant \[\therefore \]\[{{({{\lambda }_{\max }})}_{1}}{{T}_{1}}={{({{\lambda }_{\max }})}_{2}}{{T}_{2}}.\] \[\therefore \] \[{{({{\lambda }_{\max }})}_{2}}=\frac{4800\times 6000}{3000}\overset{{}^\circ }{\mathop{A}}\,=9600\overset{{}^\circ }{\mathop{A}}\,\]


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