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The half life of a radioactive element M is 30 min. How many atoms of A will be left after 2 h if there is 64 atoms of M in the beginning? Options: A. 4 , B. 64, C. 0, D. Can't say.

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Tutor

A 4
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it will be 8 . or D.
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Brain Trainer

Answer is A. 4
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Get mentored by science olympiad topper.

Yeah a.4 is correct its eqaul to 4 half life's.so 64/2^4 I.e 64/16 is equal to 4
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The Math Guru

2hrs/30min=4 half lives=>64/(2^4)=4 Ans A.4
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Physicist

A
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Biochemist

The answer is A.4 2 hrs means 4 half lives.. Hence 64 becomes 32 in 30 min. 32 becomes 16 in 60 min 16 becomes 8 in 90 min and 8 becomes 4 in 2 hrs ie. 120 min
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Home Tutor

4
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Specialist In CBSE

A.4
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64/2*(2*60/30)=4
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