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Questions  

The half-life of nickel- 65 is 2.5 days. How much of a 100.00 g sample has decayed after 7.5 days?

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By Expert Faculty of Sri Chaitanya
a
12.5 g
b
50.0 g
c
75.0 g
d
87.5 g

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detailed solution

Correct option is D

Amount left =N012n=100123=12.5% Amount decayed =100−12.5=87.5%

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