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VMMC VMMC Medical Solved Paper-2005

  • question_answer
    A black body at 200 K is found to exit maximum energy at a wavelength 14\[\mu m\]. When its temperature is raised to 1000 K, then wavelength at which maximum energy emitted is :

    A) 14mm  

    B)        7 \[\mu m\]                       

    C) 2.8\[\mu m\]    

    D)        28 mm

    Correct Answer: C

    Solution :

    From Weins displacement law \[{{\lambda }_{m}}T=\text{constant,}\] Hence, \[{{\lambda }_{m}}_{_{1}}{{T}_{1}}={{\lambda }_{{{m}_{2}}}}{{T}_{2}}\] So, \[{{\lambda }_{{{m}_{2}}}}=\frac{{{\lambda }_{{{m}_{1}}}}{{T}_{1}}}{{{T}_{2}}}=\frac{14\times 200}{1000}=2.8\mu m\]


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