Using the up, down and strange quarks only, construct, if possible, a baryon (a) with and strangeness and (b) with and strangeness, .
(a) There is no possible baryon.
(b) The baryon is .
There is no possible baryon by the use of up , down and strange quarks with and strangeness .
Hence, there is no possible baryon.
The possible baryon of three up quarks is the only which is with and strangeness, .
Hence, the possible baryon is .
Question: Figure 44-12 is a hypothetical plot of the recessional speeds v of galaxies against their distance r from us; the best-fit straight line through the data points is shown. From this plot determine the age of the universe, assuming that Hubble’s law holds, and that Hubble’s constant has always had the same value.
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