A radioactive element decays as X to_(t_(1//2)=30min)^(alpha decay) Y – InterviewSolution

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1.	A radioactive element decays as X to_(t_(1//2)=30min)^(alpha decay) Y to _(t_(1//2)=2 days)^((-2beta)beta decay)Z. Which of the following statement about this decay process is incorrect?
Answer» after two hours, less than 10% of the initial X is left MAXIMUM amount of Y present at any TIME before 30 min is less than 50% of the initial amount of X atomic number of X and Z are same the MASS number of Y is greater than X Answer :D

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