J & K CET Medical J & K - CET Medical Solved Paper-2003

  • question_answer
    The dimensional formula of Plancks constant (h)is:

    A)  \[[M{{L}^{-2}}{{T}^{-3}}]\]                                         

    B)  \[[M{{L}^{2}}{{V}^{-1}}]\]

    C)  \[[ML{{T}^{-2}}]\]                                          

    D)  \[[M{{L}^{-2}}{{T}^{-1}}]\]

    Correct Answer: B

    Solution :

                    From Plancks law, energy of a photon of frequency v is given by \[E=hv\]where h is Plancks constant. \[\therefore \] Dimensions of \[h=\frac{Dimensions\text{ }of\text{ }E}{Dimensions\text{ }of\text{ }v}\] Dimensions of\[h=\frac{[M{{L}^{2}}{{T}^{-2}}]}{[{{T}^{-1}}]}\]                                 \[=[M{{L}^{2}}{{T}^{-1}}]\]


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