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NEET Sample Paper NEET Sample Test Paper-53

  • question_answer
    . The power radiated by a black body is P, and it radiates maximum energy around the wavelength\[{{\lambda }_{0}}\]. If the temperature of black body is now changed so that it radiates maximum energy around a wavelength \[3\lambda /4\], the power radiated by it will

    A) \[\frac{4}{3}\]                          

    B) \[\frac{16}{9}\]

    C) \[\frac{64}{27}\]                                   

    D) \[\frac{256}{81}\]

    Correct Answer: B

    Solution :

    \[\lambda \propto \frac{1}{T}\] (from wein?s law) \[T'=\frac{4}{3}T\] \[P\propto {{T}^{4}}\,\] (from stefan?s law) \[P'=\frac{256}{81}\,\,P\]


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