taining 6 x 10" unde isotope has an activity half-life?
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Transcribed Image Text:Q15B.1 A sample containing 6 x 10" undecayed nuclei of
a certain radioactive isotope has an activity of 2 x 10' Bq.
What is the isotope's half-life?
Q15B.9 Estimate the kinetic energy that two C nuclei
would need to get close enough (about a 3-fm center-
to-center separation) to undergo fusion. The average
kinetic energy of an atom in a gas at an absolute tempera-
ture T is about k, T (where k, = Boltzmann's constant
1.38 x 10 "1/K). Estimate the temperature that the C gas
would need to have to undergo fusion readily.
Q15M.2 Use the graph in figure Q15.2 to estimate the energy
released by the fusion of He and C to form 0. (This
reaction takes place in some very massive stars.)
9.0
9.0
8.0
8.8
He-
7.0
8.6
6.0
8.4
5.0
8.2
4.0
8.0
3.0H
7.8
2.0-He
7.6
1.0의H
7.4
20 40 60 80 100 120 140 160 180 200 220 240 260
0.0 6-
A
(a)
20
(b)
to
10
es(MeV)
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