Physical Chemistry - IIT JEE past question Kinetics 9

1

JOHNCENA IS BACK ·2009-03-29 04:30:13

8 ALPHA
6 BETA

AGE=7.12*10TO THE POWER OF 8

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JOHNCENA IS BACK ·2009-03-29 04:32:46

IS IT CORRECT OR NOT.PLEASE TELL.

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sriraghav ·2009-03-29 04:36:16

It is 8 alpha and 6 beta

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sriraghav ·2009-03-29 04:36:46

oops didnt see cena's post....

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JOHNCENA IS BACK ·2009-03-29 07:16:41

nishant sir,

is my answer correct.

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Pavithra Ramamoorthy ·2009-03-29 07:25:44

age is it 1.5 *10¹⁰years(approx)?????

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62

Lokesh Verma ·2009-03-29 07:26:03

yes :)

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JOHNCENA IS BACK ·2009-03-29 07:34:33

sir,
u said yes to wat ramku's ans. or to mine.

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62

Lokesh Verma ·2009-03-29 07:35:18

to your john :)

i think ramkumar made some mistake!

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Pavithra Ramamoorthy ·2009-03-29 07:37:23

@john....pls tell me d formula r method u solved.....

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voldy ·2009-03-29 07:39:24

see N=N_oe^-Î»t gives the no of remianing U atoms so the no of U atoms converted to Pb is N_o-N

given ratio N_o-N / N

then solve.

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Pavithra Ramamoorthy ·2009-03-29 07:41:22

:-)

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JOHNCENA IS BACK ·2009-03-29 07:46:02

using formula for t1/2 find rate constant and substitute values as given by srinath bhaiya

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Optimus Prime ·2009-03-29 08:27:18

U²³⁸/Pb²⁰⁶= 3/1

N/N-N₀=3/1

N/N₀=3/4

but as N=N₀ e^-\lambdat=4/3

\lambdat= log ₃(4/3)

tlog _e2/T= log _e(4/3) as \lambda=log_e2/T

t=1.86x10⁹ years

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Optimus Prime ·2009-03-29 08:31:28

what is the corect answeR??

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IIT JEE past question Kinetics 9

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