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Questions  

The population p(t) at time ‘t’ of a certain mouse species satisfies 

 differential equation ddtp(t)=0.5p(t)450. If P(0)=850 , then the time at which the population becomes zero is 

a
2ln18
b
ln9
c
12ln⁡18
d
ln18

detailed solution

Correct option is A

ddtp(t)=0.5p(t)−450 dp(t)dt=p(t)2-450  2∫dp(t)900−p(t)=−∫dt⇒−2ln⁡(900−p(t))=−t+cWhen t=0, p(0)=850  ⇒c=-ln(50)−2ln⁡(900−p(t))=−t+-ln50∴2ln⁡900-p(t)50=t When population becomes zero p(t)=02ln90050=t2ln18=t

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