What was the approximate number density of CMB photons when the CMB had a higher temperature of 507 K? (Hint: You can assume that photons in a thermal distribution have a mean energy of 3kT).
Q: Suppose that not all but only 50% of the neutrons were consumed in Big Bang Nucleosynthesis. What…
A: Initially just within 1minute of bigbang simple neuleons protons and neutrons are formed.
Q: Consider a neutron star of radius of 10 km and a mass of 1.4 M⊙ that has a surface layer of pure 1H.…
A: Given; Radius,R=10km=10×103mMass of a neutron star,mS=1.4×1.98×1030kgWein's…
Q: The total energy in the beam of an accelerator is far greater than the energy of the individual beam…
A: The expression for the energy supplied to the particle is given as,
Q: Compute the momentum and energy of a top quark with a wavelength of 38nm. Energy: 5.216e-14 X Units:…
A: By the de broglie relationship,
Q: The Higgs bosons was discovered at the LHC in 2012 and is a cornerstone for our understand of the…
A: Given: The luminosity of LHC is L = 1038 m-2s-1 The proton scattering cross-section is σ = 100 mb
Q: What is the total energy of all the radiation in the current Hubble Radius (Length)? Assume H0=70…
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Q: Describe the CP violation experiment in K0 decay and explain why this experiment is particularly…
A: The fact is, long known, that nature loves symmetry. So, deductions were made to the level of…
Q: Why wouldn't you expect to detect strong 21 cmt emission from an HIl region?
A: The 21 cm line corresponds to the wavelength of hydrogen gas. At 1420 Mhz the radiation released by…
Q: Suppose the energy density of the cosmological constant is equal to the present critical density En…
A: Einstein came up with the universal or cosmological constant to balance the calculations in his…
Q: Calculate the electron velocity in the 50-GeV beam at SLAC.
A: Given: The energy of the electron is 50 GeV. Introduction: The kinetic energy of an object is the…
Q: Consider a universe where Big Bang nucleosynthesis produced significantly more 4He than 1H. Estimate…
A: We have to Consider a universe where Big Bang nucleosynthesis produced significantly more 4He than…
Q: Assume a flat Friedmann-Robertson-Walker universe, and that the density parameters for matter…
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Q: The gravitational wave source GW 170817 was used to obtain an estimate of the Hubble Constant of Ho…
A:
Q: How much energy is released when a m- muon at rest decays into an electron and two neutrinos?…
A: As we know that,The energy released in a radioactive decay can be calculated using the mass defect…
Q: Explain what is meant by the term cosmological redshift, and contrast it with the Doppler shift that…
A: A Doppler red shift is the expansion of the wavelength and decrease in the frequency when an the…
Q: In the early universe, the formation of л* or лº was through thermal interactions. What is the…
A: As mass-energy equivalence says that mass and energy are the same, mass can be converted into energy…
Q: 6 Does the proposed decay A° →p +K¯ conserve (a) electric charge, (b) spin angular momentum, and (c)…
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Q: Calculate the proton separation energy for C
A: Nucleons inside the nucleus are bound together due to their binding energy. The energy required to…
Q: 3. Suppose the scale factor varies as a(t) = Act, where A and a are constants. (a) Can the constant…
A: Given, The scale factor varies as at=Aeαt
Q: How much energy is released when a m- muon at rest decays into an electron and two neutrinos?…
A: From standard data, the rest mass energy of muon is Eμ=105.7 MeV rest mass energy of electron is…
Q: What is the size in square millimeter is the cable of 350 MCM size? (Note that the MCM is…
A: 1 MCM = 0.5067 mm^2 So to calculate the size of cable in square millimetres, 350 MCM = 350 * 0.5067…
Q: Why does the n0 meson have such a short lifetime compared to most other mesons?
A: Mesons are made up of quarks and antiquarks. The quark content of the n0 meson is given by: uu¯+dd¯…
Q: 8nhv 1 u(v,T) = (8) 3ehu/KT -1 | dv u(v, T) (9) 15h3 1. Prove that Equation (8) at the limit of…
A: To prove, uv,T=8πhν3c31ehvKT-1and ∫0∞uv,Tdv=π2K4T415h3
Q: What is the maximum energy, maximum frequency and minimum wavelength associated with an 6MV beam?
A:
Q: ng the number
A: All the neutrons are bounded to the Again every nucleus contains two neutrons . So number of helium…
Q: The decay of one type of K-meson is cited as evidence that nature favors matter over antimatter.…
A: The universe consists of matter and no antimatter. Antimatter (specifically anti-particles) are…
Q: I understand we need to start with: GPEA + KEA = Wf + GPEC + KEC mghA + 0 = umgL + mghC +…
A: The initial height of the object is point A is hA = 18 m The final height of the object is at the…
Q: Why does the η0 meson have such a short lifetime compared to most other mesons?
A: Mesons are usually unstable and have both particle and antiparticle. They decay in 1/1000000 times…
Q: Today we view the collisions between high-energy particles, why? please explain
A: we view the collisions between high-energy particles beacuse of the following reasons :-
Q: The 6563 Å Hα line emitted by hydrogen in a star is found to be redshifted by 15 Å. Estimate the…
A:
Q: What is primordial or big bang nucleosythesis?
A: Big bang nucleosynthesis is the process where nuclei production happens (except the presence of the…
Q: In the standard model, netrinos are in the lepton group. What makes neutrons dif
A: In the standard model neutrinos are brought under the lepton group. Lepton group specifically…
Q: The rest wavelength of the Hα transition of atomic hydrogen is 656.3 nm (recall that 1 nm=10-9 m).…
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Q: Apply the principle of mass-energy equivalence (E = mc2) to the ionization and recombination of an…
A: The mass defect is the defect in mass when we measure the mass of a nucleus or atom and individually…
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