The density of the atmosphere is $1.29\, kg/m^3$, then how high would the atmosphere extend ? $(g = 9.81\, m/sec^2)$ ........ $km$

  • A

    $8$

  • B

    $1.2$

  • C

    $10.3$

  • D

    None of these

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  • [KVPY 2016]

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