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Chapter 39: Problem 5
Which of the following particles does not have integer spins? a) photon b) \(\pi\) meson c) \(\omega\) meson d) \(\nu_{\mathrm{e}}\) lepton
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Three hundred thousand years after the Big Bang, the average temperature of the universe was about \(3000 \mathrm{~K}\). a) At what wavelength of radiation would the blackbody spectrum peak for this temperature? b) To what portion of the electromagnetic spectrum does this correspond?
A free neutron decays into a proton and an electron (and an anti-neutrino). A free proton has never been observed to decay into anything. Why then do we consider the neutron to be as "fundamental" (at the nuclear level) a particle as the proton? Why do we not consider a neutron to be a proton-electron composite?
Consider the proposed reaction \(\pi^{0}+n \rightarrow K^{-}+\Sigma^{+}\). Can this reaction occur?
Suppose a neutral pion at rest decays into two identical photons. a) What is the energy of each photon? b) What is the frequency of each photon? c) To what part of the electromagnetic spectrum does this correspond?
Does the proposed decay \(n \rightarrow p+\pi^{-}\) violate any conservation rules?
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