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1

:

. )13,75(. :

A=20cm . t=0,1s h

a=4mm . . .

.1 SM

t1:

1 1 . .(0,25)

1 2 (S):=10Hz.(0,25)

1 3 . .(0,5)1 4 S (0,25)1 5t1.(0,25)1 6 t2=0,1s.(0,5)1 7 NP SM SN=8cmSP=5cm

NP.(0,5)1 8tP P. PS

(0,75)2 .

t=50ms=/4. .(0,5)

2 :8

R V750nm, 400nm,C 3.10 m /s = = =

I a=10m . E D=1m .1 0,75).) 2 a..(0,5)3 .(0,75)II A=60.

.DR=57,78 i=50

1 3(0,5)

07 08: :

http://sciencephysique.ifrance.com :

8/8/2019 devoirs surveill%E9 1 PC 2007- 2008

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2

2 i.(0,5+0,5) 3 :

sinAtanr

1cosA

K

=

+

sini

K

sini'

=:sin(a b) sin acos b cos a sinb = (0,75)

4 rr nR=1,695(1,5)III Ra=6m REL

D f=20cm. 0=25.

:V R .

1 . .(0,5)2 0 a .(0,25)

3 k=3 R 750nm =

v 400nm = .(1,5)4 k=4 R 750nm =

v 400nm =.(1)

5 k=3 k=4 .(1,25)

)7(.

1 :2

2Zn(s) 2H (aq) Zn (aq) H (g)+ ++ +

1 1 :(0,25)2

2 2 2 2 2Zn (aq) / Zn(s) , H O( ) / HO (aq) , O (g) / H O (aq) , H (aq) / H (aq)+ +

1 2 .(0,25)2 t=0 m=1,0g V=40ml

C=0,50mol/l. V(H2)

Vm=25l/mol.:M(Zn)=56,4g/mol t.

750500400300250200150100500t(s)2001701541321201048664360V(H2)(ml)

2 1 t. .(0,75)

2 2 .(0,75)2 3 x

t .(0,75)2 4 x=f(t) .(0,75)3 .3 1 . :t=50st=400s.(1)

3 2 .(0,5) 4 .4 1 .(0,25)

8/8/2019 devoirs surveill%E9 1 PC 2007- 2008

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3

4 2 .(0,25)4 3t1/2 .(0,5)5 :

m' 3,0g C ' 1,0mol /= = .5 1 .(0,5)5 2 .(0,5)

........................................... :.............................

1

:2

8/8/2019 devoirs surveill%E9 1 PC 2007- 2008

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4

:

750500400300250200150100500t(s)2001701541321201048664360V(H2)(ml)

nt(H2)molx(mol)

:

( ) 2 22 ( ) ( ) ( )+ ++ +

Zn s H aq Zn aq H g

mmol

00ni(H+

)=ni(Zn)=0 xxmax