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18 Jun 2007 20:01:52 IST
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Q-1)A population of bacteria tends to double every four hours. If there are 5000
bacteria at 9:00 a.m., then how many will there be at noon?
q-2)Five gramsof a certain radioactive isotope decay to three gramsin 100
years. After how many more years will there be just one gram?
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iit kanpur - 2nd year b.tech
distinguished among the distinguished |
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18 Jun 2007 20:10:20 IST
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The answer of first one I suppose is "7500"
And the answer of "after another 100 years"
Although it is not possibly.
plZ rate me if I am correct.
Cheers !!!!!!!!!!!!!!!!!!!@@!!!!!!!!!!!!!!!!
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Always available for help !
But Remember Don't hesitate to ask a good Question but
Be damn serious for Questioning a weak one.
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18 Jun 2007 20:10:42 IST
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ur absolutely wrong
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iit kanpur - 2nd year b.tech
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18 Jun 2007 20:11:28 IST
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waterdemon ask any professor or call him to get urgent answer i bet u he know nothin.
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iit kanpur - 2nd year b.tech
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18 Jun 2007 20:20:58 IST
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if that is not the answer then I think no one knows the answer
But except for u.
Good question
Do nudge me when u tell the answer.
Cheers !!!!!!!!!!!!!!!!!!!!!!!!!!
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Always available for help !
But Remember Don't hesitate to ask a good Question but
Be damn serious for Questioning a weak one.
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19 Jun 2007 02:38:13 IST
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2) it follows first order kinetics. NT=No e-kt => 3 = 5 e(-100k) ln3/5 = -100k as per qun 1 = 5 e(-kt) ln1/5 = -kt on dividing both 100/t = 1 - (ln3)/ln5 => t = 315 hence it req. 215 more years.
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Himanshu Jain
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19 Jun 2007 02:52:02 IST
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1) i think it's 8409. using Nt = No ekt k = (1/4)ln2 now, Nt = 5000e3k on subst. we get 8409.
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Himanshu Jain
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19 Jun 2007 08:15:44 IST
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very good him congrats ur right
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iit kanpur - 2nd year b.tech
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19 Jun 2007 08:16:58 IST
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u have a very good concept
i think u will make it to iit
keep going
tell me ur email id and i will send u ebooks of such good questions
all americans refer this books
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iit kanpur - 2nd year b.tech
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19 Jun 2007 15:09:02 IST
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hey
I think no interference is required here .
cheers
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Puneet Agrawal
IIT Delhi
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