Estimate the critical density of the universe if the Hubble's constant was 100 km/s/Mpc.
Q: Estimate the age of the Universe, in years, using an outdated value of 99.90 km/s/Mpc for Hubble’s…
A: Outdated value is, 99.9 km/s/Mpc So, the age of universe is calculated as, Age= 1Outdated value
Q: Pretend that galaxies are spaced evenly, 4.0 Mpc apart, and the average mass of a galaxy is 1.0 x…
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Q: Calculate the age of the universe if the Hubble constant were 65 km/s/Mpc.
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Q: critical density
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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: Assuming that hydrogen fusion requires the Universe to have a temperature of T ≥ 107 K (as measured…
A: The cosmic microwave background radiation (CMBR) is electromagnetic radiation, generated in the…
Q: What would be the Hubble constant if the universe were 18 billion years old?
A: The age of universe is given as, t = 18 billion years (or) t = 18×109 years TO DETERMINE: The…
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: Consider a universe in which the Hubble constant has been measured to have the value H0 = 50…
A: Hubble's law gives the idea that the universe is continuously expanding, and that galaxies are…
Q: If a galaxy is 9.0 Mpc away from Earth and recedes at 488 km/s, what is H0 (in km/s/Mpc)? km/s/Mpc…
A: The question above has been given from Hubble's law. This law is also known as the Hubble-Lemaitre…
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: Assume a flat FRW universe, dominated by radiation throughout its history. Calculate the physical,…
A: The objective of the question is to calculate the physical, cosmological horizon size at a given…
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: Calculate the critical density of a universe with Hubble constant of 89 km-s¹.Mpc¯¹.
A: It is observed that galaxies are moving away from each other and the farther they are faster they…
Q: Suppose that we were to discover that all galaxies are actually twice as far away as we think. How…
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Q: What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…
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Q: If a galaxy is 9.2 Mpc away from Earth and recedes at 475 km/s, what is H0 (in km/s/Mpc)?
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Q: Pretend that galaxies are spaced evenly, 2.0 Mpc apart, and the average mass of a galaxy is 1.0 x…
A: We know that:-Spherical galaxy average density,ρ=M43πr23 Equation 1r=2.0 Mpcconvert Mpc to…
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: 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: Using a value for Hubble's constant of 71 km/s per Mpc, find the recession velocity of a galaxy at a…
A: All observed galaxies were found to be redshifted which meant they were moving away from the Earth.…
Q: Suppose the Hubble constant were not 22 but 53 km/s per million light-years. Then what would the…
A: Given: New Hubble constant, H' = 53 km/s per million light-years
Q: The energy density ϵ in radiation is related to its temperature by ϵ=αT4. Compute the temperature…
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Q: Suppose that a galaxy has 109 M⊙ of neutral HI gas with a temperature of about 10 K. Estimate the…
A: Given Data: The mass of the galaxy is, M = 109 M Temperature about 10k The luminosity of the 21cm…
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: Calculate the temperature of the universe when photons can no longer disassociate deuterons. Use the…
A: Given: The photons can no longer disassociate deuterons.
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: If a galaxy is 8.9 Mpc away from Earth and recedes at 510 km/s, what is H0 (in km/s/Mpc)?
A: The Hubble constant can be calculated by v=H0d Where v is velocity in km/s Ho is Hubble constant in…
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: (a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…
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Q: Assuming the matter temperature equalled the radiation temperature at the recombination epoch,…
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Q: A340F capacitor and a 3.60 μP capacitor are connected in series. (a) A charge of 4.60 mC is placed…
A: Introduction:- The capacitors are connected to the resistors.Given:- Objectives:- To find the rate…
Q: What is the redshift z of a galaxy 186 Mpc away from us? Note: Assume a value of the Hubble…
A: Hubble's law, also known as Hubble- Lemaitre law states that the velocity of the galaxy, also called…
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: Calculate the critical density necessary for a closed universe for two extremes of the Hubble…
A: The critical density necessary for a closed universe for two extremes of the Hubble constant. given,…
Q: If a galaxy is 8.8 Mpc away from Earth and recedes at 498 km/s, what is H0 (in km/s/Mpc)? _______…
A: The required value of Hubble’s constant is, The required value of Hubble time is,
Q: What would be the critical density of matter in the universe if the value of the Hubble constant…
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Q: Calculate the Hubble time for a universe with a Hubble constant of 60 km-s-1-Mpc-1.
A: Edwin Hubble observed that the galaxies were moving away from us. He calculated their recession…
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…
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