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Q.

The half-life of the isotope  Na 24 11  is 15 hrs. How much time does it take for 78th of a sample of this isotope to decay?

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a

45 hrs

b

75 hrs

c

55 hrs

d

65 hrs

answer is D.

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Detailed Solution

Undecayed isotope =1-78=18

∴NN0=12t/T⇒18=12t/15⇒t15=3 or  t= 45 hours.

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