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: 1388
: 36
** : 8
: 3263
: 27/01/2008

: 3     25 2008 - 12:14

( )


: RL 171

1.1. i UBC -

-.

: uBC = R.i

UBC i .

i

i = U BC/ R

1.2.1. .

( i = f(t .

: I = 6,0 mA

1.2.2. tau = 0,1 ms

i = I

1.2.3.

tau = L/R


tau = 0,10.103 s = 0,10 ms


.

1.3.

1.3.1.

:

E = UAC = uAB + uBC

E = L di/dt + Ri



E /L = di/dt +R/L. i

1.3.2. di/dt = 0 :

E /L = ( R/L ).I

: I = E /R

:

I = 6,0.103 A = 6,0 mA




1 .

1.1 :

126C 12 : Z = 6 6

: A Z

: A = 12

6

146C 14 : : 6 8

1.2 :

- - - A -

1.3 14 :

146C = 147N+ 0-1 e

- -

1- - N Z -

2-

1.4 14 :

:

E l (14C) = delta m . c

delta m > 0

E (14C) = {Z.mp + (A Z).mn m(146C )} . c

E (14C) = {6 . 1,672 621.1027 + 8 . 1,674 927.1027


2,325 84.1026} . (2,998.108)


:

E (14C) = 1,589.1011 J

1.5. 14 - -

E (14C) / A = 1,589.1011 J/14 = 1,135.1012 J/nuclon


1.6. -1.3-

146C = 147N+ 0-1 e

:

E = (me- + m( ) m( )).c

E = (9,109 381.1031 + 2,325 27.1026 2,325 84.1026) . (2,998.108)
E= 4,304 . 1013 J

: 4,304 . 1013 J.

.................................................. .................................................. ....

2 14


2 . 1 - :

N(t) = N0.e*.t *

2 . 2 . 1 .

2.2.2. :



t =t1/2 , N(t1/2) = N0/2

:

N(t1/2) = N0. = N0/2

N0 :



e-lamdat1/2 = 1/2 lamda :

t1/2 = ln 1/2 lamda-


: t1/2 = ln2/lamda


2 . 2 . 3.

lamda = = 1,22.104 an1

3 . 2 .1

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