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NEET NEET SOLVED PAPER 2015 (C)

  • question_answer
    On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If \[{{T}_{P}},{{T}_{Q}}\] and \[{{T}_{R}}\] are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that                                   

    A)  \[{{T}_{P}}>{{T}_{Q}}>{{T}_{R}}\]            

    B)  \[{{T}_{P}}>{{T}_{R}}>{{T}_{Q}}\]            

    C)         \[{{T}_{P}}<{{T}_{R}}<{{T}_{Q}}\]       

    D)         \[{{T}_{P}}<{{T}_{Q}}<{{T}_{R}}\]

    Correct Answer: B

    Solution :

    We know from Weins displacement law \[{{\lambda }_{m}}T\] = constant So.               \[T\propto \frac{1}{{{\lambda }_{m}}}\] As,               \[{{\lambda }_{r}}>{{\lambda }_{g}}>{{\lambda }_{v}}\] So,          \[{{T}_{r}}<{{T}_{g}}<{{T}_{v}}\] Given   \[P\to {{v}_{\max '}}\,Q\to {{r}_{\max '}}R\to {{g}_{\max }}\] Hence,       \[{{T}_{Q}}<{{T}_{R}}<{{T}_{P}}\] i.e.              \[{{T}_{P}}>{{T}_{R}}>{{T}_{Q}}\]


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