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JEE Main & Advanced Sample Paper JEE Main Sample Paper-27

  • question_answer
    The proper life of pion \[({{\pi }^{+}})\] is \[2.5\times {{10}^{-8}}s\] . In a beam of pions travelling with a speed of \[0.9\,c\], the pion in the libratory frame can travel a maximum distance of

    A)  \[6.75\] m                    

    B)  \[15.49\] m

    C)  \[7.50\] m                    

    D)  \[17.10\] m

    Correct Answer: A

    Solution :

    The pion, in the laboratory frame can travel \[=25\,\times {{10}^{-8}}\,\times 0.9\,\times 3\times {{10}^{8}}\,m=6.75\,m\]


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