Isotopes of oxygen with mass number less than 16 undergo B' emission. ASsuming an equimolar mixture of 14 and 15 O, find the ratio of the nuclides at the end of one hour. Given that t1/2(40) = 71s and t/2(50) = 124s. At what time will the above said ratio be equal to 0.25?
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NCRT question class 12th
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