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Chapter 44: Q28P (page 1364)
What quark combination is needed to form (a) and (b)
(a) The quark combination of is.
(b) The quark combination of is .
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A neutral pion initially at rest decays into two gamma rays:
. Calculate the wavelength of the gamma rays. Why must they have the same wavelength?
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?
Question: Given figure shows the paths of two particles circling in a uniform magnetic field. The particles have the same magnitude of the charge but opposite signs. (a)Which path corresponds to the more massive particle? (b)If the magnetic field is directed into the plane of the page, is the more massive particle positively or negatively charged?
Certain theories predict that the proton is unstable, with a half-life of about 1032 years. Assuming that this is true, calculate the number ofproton decays you would expect to occur in one year in the water ofan Olympic-sized swimming pool holding 4.32 x 105L of water.
Because the apparent recessional speeds of galaxies and quasars at great distances are close to the speed of light, the relativistic Doppler shift formula (Eq.37-31) must be used. The shift is reported as fractional red shift
(a)Show that, in termsof,the recessional speedparameterisgiven by
.
(b) A quasar in 1987 has . Calculate its speed parameter.
(c) Find the distance to the quasar, assuming that Hubble鈥檚 law is valid to these distances.
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