8/9/2019 devoir2 Amrani 2 bac

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--7 21 1h45mn07-08.....

( Lm5=1V 0=t:-I++K(

L/lom3-10.5=1CLm5=2V 2O2HL/lom

2-10.25=2C .

:H2O2 (aq) + 2I-(aq) + 2H

+(aq) I2 (aq) + 2H2O (l)

[ ]2I .

11- I- (aq)H2O2 (aq). .

22- .. mx.

13- ]2I[x t2V+1V=V.

14-1- [ ]2d I

vdt

=

14-2- v nm4=t.

14-3- .

:226 1: 488 86X

Y Ra Rn He +

11- xy .12- m Ra u.

3- Ra:13-1- El(Ra)MeV.13-2- .

4- :1,71.103MeV=El(Rn), :veM28=E

-14-114-2- .

:2C/u =931,5MeV1

Ra22688 n10 p01 ))u 225,977 1,009 1,007

8/9/2019 devoir2 Amrani 2 bac

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0 0,5 1 1,5 2 2,5 3

Uc(V)

t(ms)

UCE C

K

R

+q

1(.) CU C, 2-:E. K 0=t

CU )2(

: CU -11dU c

Uc Edt+ =

CR=12- 1t .13- E=CU. E.14- . 1t.15- C.R=10016- e

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2

: . .