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Chapter 44: Q30P (page 1364)

Using the up, down and strange quarks only, construct, if possible, a baryon (a) with $q = + 1$ and strangeness $S = - 2$ and (b) with $q = + 2$ and strangeness, $S = 0$ .

Short Answer

Expert verified

(a) There is no possible baryon.

(b) The baryon is . $u u u$

Step by step solution

01

(a) A baryon with q=+1and strangeness,S=−2 .

There is no possible baryon by the use of up , down and strange quarks with $q = + 1$ and strangeness $S = - 2$ .

Hence, there is no possible baryon.

02

(b) A baryon withq=+2 and strangeness, S=0.

The possible baryon of three up quarks is the only which is with $q = + 2$ and strangeness, $S = 0$ .

Hence, the possible baryon is . $u u u$

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Most popular questions from this chapter

Consider thedecay $Λ^{0} \to p + π^{-}$ withthe $Λ^{0}$ at rest. (a) Calculate the disintegration energy. What is the kinetic energy of (b) the proton and (c) the pion?

Which conservation law is violated in each of these proposed reactions and decays? (Assume that the products have zero orbital angular momentum.)

$(a) \land^{0} \to {pK}^{-}; (b) Ω^{-} \to \sum_{}^{-} + π^{0} (S = - 3, q = - 1, m = 162 MeV / c^{2}, and m_{s} = \frac{3}{2} forΩ); (c) K^{-} + p \to \land 0 + π^{+}$

An object is $1.5 \times 10^{4} ly$ fromus and does not have any motion relative to us except for the motion due to the expansion of the universe. If the space between us and it expands according to Hubble’s law, with $H = 21.8 \frac{mm}{s} \cdot ly$ ,

(a) how much extra distance (meters) will be between us and the object by this time next year and

(b) what is the speed of the object away from us?

Which conservation law is violated in each of these proposed decays? Assume that the initial particle is stationary and the decay products have zero orbital angular momentum.

(a) $μ^{-} \to e^{-} + ν_{μ}$ ; (b) $μ^{-} \to e^{+} + ν_{e} + {v^{-}}_{μ}$ ;(c) $μ^{+} \to π^{+} + ν_{μ^{+}}$

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?

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