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JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank Graphical Questions

  • question_answer
    The count rate of 10g of radioactive material was measured at different times and this has been shown in the figure. The half-life of material and the total counts (approximately) in the first half life period, respectively are [CPMT 1986]

    A)            4h, 9000                                 

    B)            3h, 14000

    C)            3h, 235

    D)            3h, 50

    Correct Answer: B

    Solution :

                       Read time for 50 count rate, it gives half-life period of    3 hrs, one small square gives 600 counts (10 × 60). The number of small squares between graph and time axis are approx 24 Hence count rate = \[24\times 600=14400\]


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