Physics H133: Problem Set #$ps_num
Here are some hints, suggestions, and comments on the problem set.
## Two-Minute Problems

Remember to give a **good** explanation, no longer than
two sentences.

- Q14T.5: How would Eq.~(Q14.18) look like for proton emission?
From which principle was this equation derived?
- Q14T.6: Review p. 252.
- Q15T.4: How are U and Pu bombs different in their explosion
mechanism?

## Chapter Q14 and Q15 Problems

- Q14B.8: What is a Bq? See Eq. (Q14.25).
- Q15B.4: Adjust T so that the average thermal kinetic energy
is enough to overcome the Coulomb barrier between the two
deuterium nuclei.
- Q15B.6: To make a stable nucleus radioactive, one needs to change
the N/Z ratio, add enough nucleons to make it unstable against
alpha decay, or excite a nucleon to a higher energy level.
Are these likely with electrons, alpha particles or gamma rays?
Remember that weak interaction processes have a low probability
of occuring and a gamma ray photon is absorbed only if the energy
is just right and even then the excited level has to last long
enough. Now consider neutrons.
- Q14S.2: Again, see Eq. (Q14.25).
- Q14S.7: Apply the ideas from Section Q14.1.
- Q15S.6: How much energy per hydrogen atom does solar fusion yield?
How much energy has the sun radiated over its 5 billion
year lifetime? Assume that the rate of energy production
has remained constant over this period.
- Q15S.4: (a,b) Just plug in the given numbers into the scaling laws
and evaluate the corresponding radius of devastation.
(c) Interpret the numbers you obtained.

Your comments and
suggestions are appreciated.

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**Physics H133: Hints for Problem Set $ps_num.**

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