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Chapter 44: Q47P (page 1365)
How much energy would be released if Earth were annihilated by collision with an anti-Earth?
this energy will power the sun for years.
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A proton has enough mass energy to decay into a shower made
up of electrons, neutrinos, and their antiparticles. Which of the following
conservation laws would necessarily be violated if it did: electron lepton number or baryon number?
Question: Due to the presence everywhere of the cosmic background radiation, the minimum possible temperature of a gas in interstellar or intergalactic space is not 0 K but 2.7 K. This implies that a significant fraction of the molecules in space that can be in a low-level excited state may, in fact, be so. Subsequent de-excitation would lead to the emission of radiation that could be detected. Consider a (hypothetical) molecule with just one possible excited state. (a) What would the excitation energy have to be for 25% of the molecules to be in the excited state? (Hint: See Eq. 40-29.) (b) What would be the wavelength of the photon emitted in a transition back to the ground state?
A particle game.Figure 44-13 is a sketch of the tracks made by particles in a fictionalcloud chamber experiment (with a uniform magnetic field directed perpendicular to the page), and Table 44-6 gives fictionalquantum numbers associated with the particles making the tracks. Particle A entered the chamber at the lower left, leaving track and decaying into three particles. Then the particle creating track 1 decayed into three other particles, and the particle creating track 6 decayed into two other particles, one of which was electrically uncharged鈥攖he path of that uncharged particle is represented by the dashed straight line because, being electrically neutral, it would not actually leave a track in a cloud chamber. The particle that created track is known to have a seriousness quantum number of zero.
By conserving the fictional quantum numbers at each decay point and by noting the directions of curvature of the tracks, identify which particle goes with track (a) 1, (b) 2, (c) 3, (d) 4, (e) 5, (f) 6, (g) 7, (h) 8, and (i) 9. One of the listed particles is not formed; the others appear only once each.
Particle | Charge | Whimsy | Seriousness | Cuteness |
A | 1 | 1 | -2 | -2 |
B | 0 | 4 | 3 | 0 |
C | 1 | 2 | -3 | -1 |
D | -1 | -1 | 0 | 1 |
E | -1 | 0 | -4 | -2 |
F | 1 | 0 | 0 | 0 |
G | -1 | -1 | 1 | -1 |
H | 3 | 3 | 1 | 0 |
I | 0 | 6 | 4 | 6 |
J | 1 | -6 | -4 | -6 |
What quark combination is needed to form (a) and (b)
A positively charged pion decays by Eq. 44-7 :
What must be the decay scheme of the negatively charged pion?
(Hint:The is the antiparticle of the )
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