8/8/2019 Devoir de Phy 1 _2 Bac PC_ 3

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) (

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

:: :

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

1) :(

A- N . . . M SM = d )1( t1)2()3(MS

N -12- VM -34- d MS

B- 2. -12- 0 =600nm n = 1,5.

2.1- 2.2- e =10cm

3- AB i1 = 30. i2 -3.1C = 3.108 AB -3.2 m/s

:

0,3m/2div -

5ms/2div -

1

)2(

): 2)Cs137

55.-

Ba -1 - -23- t = 0 137m0 = 10g.

3.1- 75% -3.23.3-

3.4- )BaRb( :nuclonMevRb /66,889 =

4- :nHeHH1

0

4

2

3

1

2

1++

4.1- E

4.2- . ECn Emnm Mev

:m(Cs)=136,90707u ; m(Ba) =136,90581u ; (Cs) =8,4.10-10s-1 ; M(Cs)=137g/mol ;; m(e) =55.10

-5u ; mn =1,0087u ; mp =1,00734u ;1u =931,5Mev/cNA =6.10

23mol

-1

mt = 3,0155u )()( md = 2,01355u

))1

))2

))3

y

y

y

x

t

t

Ce

A

B

nn

i

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):)7

( H3O Mg +

+C- ).

:)(2

)(/ saq MgMg

+

2)(3 /HOH aq+

1( )1(2( t = 0Va=50mL

Ca=0,5mol/l m =20mg . . V T.

))0,5 )2-12-2( xmax)0,5(2-3( xn(H2) t)1(x H2 )2-4

xmax2H

ppmax t

2-5( )1( x . t -

2Hpxmaxpmax1)(

)(1 t = 210st = 90s - )(.1 -

: M(Mg) =24,3g/mol p.V=n.R.T

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