NEET Sample Paper NEET Sample Test Paper-39

  • question_answer 26) If \[{{\lambda }_{m}}\]denotes the wavelength at which the radia-tive emission from a black body at a temperature is maximum, then

    A) \[{{\lambda }_{m}}\propto {{T}^{4}}\]

    B) \[{{\lambda }_{m}}\]is independent

    C) \[{{\lambda }_{m}}\propto T\]

    D) \[{{\lambda }_{m}}\propto {{T}^{-1}}\] 

    Correct Answer: D

    Solution :

     According to Wien's displacement law, the wavelength\[({{\lambda }_{m}})\]of maximum intensity of emission of black body radiation is inversely proportional to absolute temperature (T) of the black body. There- fore, Wien's law is \[{{\lambda }_{m}}T=\text{constant}\] or \[{{\lambda }_{m}}=\frac{cons\tan t}{T}\] or \[{{\lambda }_{m}}\propto \frac{1}{T}\] or \[{{\lambda }_{m}}\propto {{T}^{-1}}\]

adversite



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