1 5 5

: C14

  1. #1

    Jul 2011
    -
    14,582

    C14



    5000 .





    -14.

    -14 50000 .

    -14

    cosmic rays ѡ .

    ɡ

    -14 .

    -14 .

    -14

    ( ) 5730 .

    n + 14N → 14C + 1H

    14 (B) .

    5730 .

    14 .


  2. #2

    Jul 2011
    -
    14,582

    : C14

    14 14 .

    14

    14

    -14 .

    -12 -14 .

    -14 1012 -12

    -14

    .

    -14 .

    :

    -14 -14

    -12 -14 -14

    .

    -12 .

    -14 -12 .



    t = [Ln (Nf/No) / (-0.693) ] x t1/2

    Ln Nf/No -14 .

    t1/2 -14 5730 .

    -14 10%

    :

    t = [ Ln (0.10) / (-0.693) ] x 5,700 years

    t = [ (-2.303) / (-0.693) ] x 5,700 years

    t = [ 3.323 ] x 5,700 years

    t = 18,940 years old

    :

    -14 5730 -14 60000 .

    -14 -40

    1.3x109 .

    -238 4.5x109 -232 14x109

    -87 49x109 .

    .

    -14 1940



    -12 -14 .


  3. #3
      Eiman
    Jul 2011
    -
    14,743

    : C14

    .......

  4. #4

    Jul 2012
    5,298

    : C14


  5. #5

    Jul 2011
    -
    4,543

    : C14

    SARAH

: 1 (0 1 )

  1. : 8
    : 26-01-2017, 09:46 AM
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    : 2
    : 02-02-2014, 03:00 PM
  3. yousef khaled
    : 0
    : 18-06-2013, 03:57 PM
  4. Eiman
    : 0
    : 19-04-2013, 04:52 PM
  5. : 2
    : 16-08-2012, 01:33 AM

: 0

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