Compute a numerical value (in units of protons/m3 ) for the critical density of our Universe. How does it compare to the density of hydrogen gas at standard temperature and pressure?
Q: Pretend that galaxies are spaced evenly, 4.0 Mpc apart, and the average mass of a galaxy is 1.0 x…
A:
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: e gravitational energy of a pair of colliding galaxies , each of mass 10 Mo separated by a distance…
A:
Q: In the deep space between galaxies, the density of atoms is as low as 106 atoms/m3, and the…
A: To determine,Part aThe pressure in the Pa.part bWhat volume (in m3) is occupied by 5 mol of gas.part…
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: The nuclei of some galaxics are thought to contain supermassive black holes with M = 3 x 10°M9. How…
A: The Schwarzschild radius of a supermassive black hole can be estimated using an empirical…
Q: What was the maximum age of the universe predicted by Hubble's first estimate of the Hubble…
A: Hubble’s time: It is defined as follows, Here H is the Hubble’s constant which has unit km/s/Mpc…
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: 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: Calculate the critical density of our universe.
A: Our universe is expanding and critical density is defined as the average density of matter that is…
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: Critical density of a universe is found to be 6×10-27 kg/m. Estimate the value of Hubble constant.
A: It was observed that galaxies are moving away from each other and the farther they are faster they…
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: Consider a universe identical to ours, but where the only difference is that the mass of the proton…
A: Here is the explanation in the given image
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: In the deep space between galaxies, the density of atoms is as low as 106 atoms/m3, and the…
A:
Q: The mass of the neutrino plays an important role in the universe. Suppose the mass of two neutrinos…
A:
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: 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: Explain how the Hubble constant, H0, can be used to make an estimate for the age of the Universe.…
A: Hubble's Law gives us the conclusion that the universe is always expanding. It takes very short…
Q: Estimate the critical density of the universe if the Hubble's constant was 100 km/s/Mpc.
A:
Q: 1. What is the total energy output of a radio galaxy in the local Universe (at z = 0.1) with a flux…
A:
Q: What is the estimated age of the Universe (in years) if the Hubble constant is 70 km/s/Mpc?
A:
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: Use the Friedmann equations to show that the deceleration parameter go and the density parameter N…
A: According to Dark energy and the cosmological constant, the acceleration of the scale factor is…
Q: Estimate the critical density of the universe if the Hubble's constant was 50 km/s/Mpc.
A: The minimum density that is required to stop the expansion of the universe is defined as the…
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: Given the age of a universe as 15.6 billion years. A galaxy is found to be moving at 620 km-s-1 from…
A: Hubble time is the amount of time it took for a universe to reach its current state. For calculating…
Q: Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature…
A:
Q: If most galaxies are moving away from us, are we at the center of the universe? Why or why not?
A: Introduction: The universe encompasses everything in existence, from the smallest atom to the…
Q: Assume the average density of the universe is 0.1 of the critical density needed for closure. What…
A:
Q: (a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…
A:
Q: In the deep space between galaxies, the number density of atoms is as low as 106 atoms/m3, and the…
A:
Q: Explain why the universe cannot be older than the Hubble time.
A: Given: To explain universe is not older than the Hubble time as,
Q: What would be the critical density of matter in the universe if the value of the Hubble constant…
A:
Q: If the universe had a density equal to its estimated critical density of 9= 10-30 g/cm3, and if it…
A: Given Critical density ρc = 9×10-30 g/cm3 Mass (M) = 2.0 × 1030 kg
Compute a numerical value (in units of protons/m3
) for the critical density of our Universe. How
does it compare to the density of hydrogen gas at standard temperature and pressure?
Trending now
This is a popular solution!
Step by step
Solved in 4 steps
