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In a specimen the number of nuclei of a radioactive element at t = 0 time is 2048. If its half life is 5 hr, how many nuclei would have been disintegrated in 25 hr?

Answer»

udent,◆ ANSWER -1984 nuclei● Explaination -Nuclei remanining after 25 HOURS are GIVEN by -N = N0.(1/2)^(t/t½)N = 2048 × (1/2)^(25/5)N = 2048 × 1/2^5N = 2048 / 32N = 64 nucleiNo of nuclei disintegrated are -∆N = N - N0∆N = 2048 - 64∆N = 1984 nucleiTherefore, 1984 nuclei are disintegrated in 25 hours.Thanks dear...



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