CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    The earth absorbs \[{{10}^{22}}\] J of energy from the sun every day. The percentage increase in the mass of earth every day will be (mass of earth \[=\text{ }6\times {{10}^{24}}\] kg)

    A)  \[1.82\times {{10}^{-10}}%\]     

    B)  \[1.82\times {{10}^{-15}}%\]

    C)  \[1.85\times {{10}^{-17}}%\]     

    D)  \[1.85\times {{10}^{-18}}%\]

    Correct Answer: D

    Solution :

                     Mass equivalent to \[{{10}^{22}}J\]of energy \[m=\frac{E}{{{c}^{2}}}=\frac{{{10}^{22}}}{{{(3\times {{10}^{8}})}^{2}}}\]     \[=\frac{{{10}^{6}}}{9}kg\] Percentage increase in mass \[=\frac{{{10}^{6}}}{9}\times \frac{100}{6\times {{10}^{24}}}\] \[=1.85\times {{10}^{-18}}%\]


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