Calculate the temperature of the universe when photons can no longer disassociate deuterons. Use the mean value of the distribution.
Q: (a) Estimate the mass of the luminous matter in the known universe, given there are 1011 galaxies,…
A: mass of one star, m = 1.5 ×mass of the sun m = 1.5 ×1.989 × 1030 =…
Q: (a) Calculate the approximate age of the universe from the average value of the Hubble constant, H0…
A: ( a ) To find the time t =dv t = 1Mly106ly1Mly9.46×1012km1ly20km/s t = 4.73 x 1017s
Q: Calculate the cyclotron frequency for a non-relativistic proton per Tesla of magnetic field.
A:
Q: Distances to local galaxies are determined by measuring the brightness of stars, called Cepheid…
A: Absolute brightness is a constant and is 10 parsecs from Earth whereas measured brightness depends…
Q: What is the total energy of all the radiation in the current Hubble Radius (Length)? Assume H0=70…
A:
Q: Pretend that galaxies are spaced evenly, 8.0 Mpc apart, and the average mass of a galaxy is 1.0 ✕…
A: Average density of the matter in the universe ρavg=M43πd23=6Mπd2
Q: responding to a claim that the number of grains of sand was infinite, calculated that the number of…
A: Given information: The Archimedes estimate of the number of grains needed to fill the universe (n1)…
Q: a) Define the term “standard candle” as used in cosmology b). The flux is defined as f(Dlum) = L…
A:
Q: Assume that the protons in a hot ball of protons each have a kinetic energy equal to kT, where k is…
A:
Q: A galaxy in the constellation Pisces is 5210 Mly from the earth. (a) Use the Hubble law to calculate…
A: Given A galaxy in the constellation Pisces is 5210 Mly from the earth. (a) Use the Hubble law to…
Q: Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. At this same…
A: Given that for a universe Rate of expanding H = 90 km s-1 Mpc-1 And at this time the density ρ =…
Q: The critical mass density needed to just halt the expansion of the universe is approximately 10-26…
A: Given critical mass density needed to halt the expansion of the universe is ρcrirical = 10-26 kg/m3
Q: The matter density in the Universe today is ?m=2.7×10−27kgm−3. What would be the value of the…
A: Given that the matter density in the Universe today is 2.7×10-27 kg/m3 and the Hubble constant is 38…
Q: Given that Z = 1 + e-ße and the probabilities are: P₁ = two level system where (0,ɛ). 1. Get the…
A:
Q: diation density and m
A: The conditions and the assumptions as,
Q: An alternative Universe is dominated by a single type of matter with equation of state parameter w =…
A: Given Equation of state parameter ω=-0.1 l=60
Q: The critical mass density needed to just halt the expansion of the universe is approximately 10-26…
A: Given that,The critical mass density = 10-26 kg/m3Average mass = 7 eV/c2As we know that,If m is in…
Q: The Klein-Gordon equation at background level for a scalar field φ is given by (found in image…
A: Required : Slow roll inflation condition
Q: How to calculate K from first principles of Boltzmann statistics ?
A: The Boltzmann constant (kB or k) is the proportionality factor that relates the average relative…
Q: Problem 3. Consider a flat, single component universe. 1. For a light source at redshift z that is…
A: Given a flat single-component universe. 1.) The Hubble parameter is defined by…
Q: Explain why the cosmological principle requires that H0 must have the same value everywhere in…
A: Given Explain why the cosmological principle requires that H0 must have the same value everywhere in…
Q: The present number density of electrons in the Universe is the same as that of protons, about 0.2…
A: The present number density of electrons = 0.2m-3. Long before the formation of microwave background,…
Q: Calculate the temperature for which the ratio of free protons to free neutrons in the early stages…
A: Given information: The ratio of free protons to free neutrons is 7.0 It is mentioned that the…
Q: The energy density ϵ in radiation is related to its temperature by ϵ=αT4. Compute the temperature…
A:
Q: 3. Consider the following two universes: Universe I: flat, matter-dominated with no cosmological…
A:
Q: Compute a numerical value (in units of protons/m3 ) for the critical density of our Universe. How…
A: The critical density for the Universe is given by, ρ = 3H28πG where H is the Hubble constant and G…
Q: Choose the correct statements from the following list. (Give ALL correct answers, i.e., B, AC,…
A: Statement A: The inflationary model of the universe solves both the flatness and the horizon…
Q: What was the approximate number density of CMB photons when the CMB had a higher temperature of 507…
A:
Q: 1. Assume a flat Friedmann-Robertson-Walker universe dominated by a cosmological constant. Calculate…
A: The Friedmann-Robertson-Walker metric is based on the accurate solution of Einstein's general…
Q: According to the version of the Big Bang Theory without a Cosmological Constant (and without Dark…
A: Hubble's Law states that as the universe is expanding in all directions, the receding velocity of an…
Q: What was the lowest temperature for photons to be able to produce 0 particles in the early universe?…
A: Given: kT=mc2
Q: The expanding universe is carrying distant objects away from each other at a rate proportional to…
A: The relation between redshift and radial velocity is z=∆λλ=1+vr/c1-vr/c-1vr=radial velocityc=speed…
Q: Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature…
A:
Q: If the average density of the Universe is small compared with the critical density, the expansion of…
A: According to Hubble’s law v = HR The expression for R is R=vΔt Thus, v=HvΔtΔt=1H Here, ∆t is the…
Q: Suppose that the universe were full of spherical objects, each of mass m and radius r . If the…
A: Critical density is the average density required for the universe to halt its expansion. Such a…
Q: The rest wavelength of the Hα transition of atomic hydrogen is 656.3 nm (recall that 1 nm=10-9 m).…
A:
Q: Use Wien’s law to answer the following questions: (a) The cosmic background radiation peaks in…
A: According to Wien’s law, The temperature in this case can be obtained as
Q: a)Define the term “standard candle” as used in cosmology. b)The flux is defined asf(Dlum) =…
A:
Q: What would be your estimate for the age of the universe if you measured Hubbleʹs constant to be 33…
A: We are given the value of Hubble constant. We are to find the age of universe. We are also given the…
Q: Assume a flat Friedmann-Robertson-Walker universe, and that the density parameters for matter,…
A:
Q: Suppose a hypothetical universe is expanding (at some moment in time) at a rate of H. At this same…
A: It is given that, for a universe, at this time,the rate of expanding H=56 km s-1Mpc-1and the density…
Calculate the temperature of the universe when photons can no longer disassociate deuterons. Use the mean value of the distribution.
![](/static/compass_v2/shared-icons/check-mark.png)
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
![Blurred answer](/static/compass_v2/solution-images/blurred-answer.jpg)