Solution of JEE Advanced 2021 Paper 1 Q 4

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India Santosh Sir IITK (Apex Physics)
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Download link for JEE Advanced Paper 1 of Physics is here-

https://drive.google.com/file/d/14spcS2F8Dh0FG6USa-tR92KC5pG2vsH0/view?usp=sharing


A heavy nucleus Q of half-life 20 minutes undergoes alpha-decay with probability of 60 % and beta-decay with probability of 40 %. Initially, the number of Q nuclei is 1000. The number of alpha-decays of Q in the first one hour is



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