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NEET Sample Paper NEET Sample Test Paper-6

  • question_answer
    A black body is at a temperature 2880K. The energy-radiation emitted by this object with wavelength between. \[499nm\] and \[500nm\] is U , between \[999nm\] and \[1000nm\] is \[{{U}_{2}},\] and between \[1499\text{ }nm\] and \[1500\text{ }nm\] is \[{{U}_{3}}\] then (Wien's constant)  \[b=2.88\times {{10}^{6}}nm-K)\]:

    A)  \[{{U}_{1}}>{{U}_{2}}\]             

    B)  \[{{U}_{2}}>{{U}_{1}}\]

    C)  \[{{U}_{1}}=0\]                  

    D)  \[{{U}_{3}}=0\]

    Correct Answer: B

    Solution :

    As,         \[{{\lambda }_{m}}T\] = constant \[\Rightarrow \]               \[{{\lambda }_{m}}=\frac{2.88\times {{10}^{6}}nmK}{2880\,K}=1000\,nm\]


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