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KVPY Sample Paper KVPY Stream-SX Model Paper-12

  • question_answer
    If \[{{10}^{22}}\]gas molecules each of mass \[{{10}^{-\,\,26}}\] collide with a surface (perpendicular to it) elastically per second over an area \[1\,{{m}^{2}}\]with a speed \[{{10}^{4}}\,\text{m/s,}\]the pressure exerted by the gas molecules will be of the order of:

    A) \[{{10}^{8}}\text{N/}{{\text{m}}^{2}}\]

    B) \[{{10}^{4}}\text{N/}{{\text{m}}^{2}}\]

    C) \[{{10}^{16}}\text{N/}{{\text{m}}^{2}}\]

    D) \[{{10}^{3}}\text{N/}{{\text{m}}^{2}}\]

    Correct Answer: D

    Solution :

    \[P=\frac{(2mV)N}{A}=\frac{2({{10}^{-26}})({{10}^{4}}){{10}^{22}}}{1}=2\frac{N}{{{m}^{2}}}\] NTA answer is [D] Carrer Point Option [Bonus.].


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