The half-life of \[_{38}^{90}Sr\] is 20 years. If its sample having initial activity of 8000 dis/min is taken, what would be its activity after 80 years [MP PMT 2000]

The half-life of \[_{38}^{90}Sr\] is 20 years. If its sample having in

1.	The half-life of \[_{38}^{90}Sr\] is 20 years. If its sample having initial activity of 8000 dis/min is taken, what would be its activity after 80 years [MP PMT 2000]
A.	500 dis/min
B.	800 dis/min
C.	1000 dis/min
D.	1600 dis/min
Answer» B. 800 dis/min

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The half-life of \[_{38}^{90}Sr\] is 20 years. If its sample having initial activity of 8000 dis/min is taken, what would be its activity after 80 years [MP PMT 2000]

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