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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    The height of the point vertically above the earth's surface at which the acceleration due to gravity becomes 1% of its value at the surface (R is the radius of the earth)

    A)  \[8\,R\]                       

    B)  \[9\,R\]

    C)  \[10\,R\]                     

    D)  \[20\,R\]

    Correct Answer: B

    Solution :

    The gravitational acceleration at a height from the earth's surface is given by \[{{g}_{n}}=\frac{g{{R}^{2}}}{{{(R+h)}^{2}}}\] Given,        \[gh=\frac{g}{100}\]                 \[\frac{g\,{{R}^{2}}}{{{(R+h)}^{2}}}=\frac{g}{100}\] or         \[R+h=10R\] or \[h=9R\]


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