Calculate the Hubble constant for a universe which is 10 billion years old.
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: 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: 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: Imagine that an observed distant galaxy is measured to have a distance of 40 Mpc by a Type Ia…
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Q: Calculate the age of the universe if the Hubble's constant was 60 km-s¹ Mly¹.
A: Our universe is constantly expanding, It was observed by Edwin Hubble when he saw the galaxies…
Q: What is the evidence that the universe was very uniform during its first 400,000 years?
A: The universe was formed from a big explosion called Big Bang. In the beginning, everything was…
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: If a galaxy has a redshift of 0.35 and the hydrogen line has a wavelength of 486.3 nm, what will be…
A: Redshift happens when the source of light moves away from the observer. The frequency observed will…
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: If we find a galaxy that is moving away at 72,000 km/s, what does Hubble’s law tells us about the…
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Q: Given the redshift of a galaxy is 0.440 the observed wavelength is 480 nm. What is the actual…
A: When the source of electromagnetic radiation is moving away from the observer the radiation will…
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 30 Mpc away from Earth and recedes at 400 km/s, what is Hubble's constant?
A: It is observed that galaxies are moving away from each other instead of coming closer. Based on…
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: If the value of the Hubble's constant were found to be 60 km/s/Mpc, what would the Hubble time be?
A: The galaxies in our universe are moving away from each other. This was observed by Edwin Hubble. He…
Q: What does the size difference of the irregularities in the background radiation tell us about the…
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Q: Estimate the critical density of the universe if the Hubble's constant was 100 km/s/Mpc.
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Q: If a galaxy is 10.0 Mpc away from Earth and recedes at 520 km/s, what is Hubble's constant?
A: Edwin Hubble in his observations found that the galaxies were moving away from us instead of getting…
Q: Calculate the Hubble time for a universe with a Hubble constant of sixty kilometers per second per…
A: Given:Hubble's constant, Ho = 60km/(s Mpc)Asked:Hubble's Time, tH = ?
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: Why aren’t the fluctuations there in the formation of Galaxies and other similar entities?
A: Galaxies and the other similar entities could not be without the existence of fluctuations in the…
Q: What is the evidence that the universe was very uniform during its first 400,000 years?
A: The evidence of the uniform nature is explained by particle physics. Before the formation of the…
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: Use the redshift of 3.8 for 4C41.17, a powerful radio galaxy, to determine the distance of the…
A: (a) the speed of the galaxy is, vc=z+12-1z+12+1vc=3.8+12-13.8+12+1=0.917v=0.9173×105 km/s=2.75×105…
Q: Calculate the age of the universe for the following Hubble's constant, 200 1... - N (d) 20 km/s/Mpc
A: As per Hubble's law, the universe is expanding. If we assume that the expansion's apparent velocity…
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: What was the lowest temperature for photons to be able to produce 0 particles in the early universe?…
A: Given: kT=mc2
Q: How can you explain the fact that the Andromeda Galaxy appears to be approaching us rather than…
A: Each element emits photons only at a certain wavelength. They form either emission or absorption…
Q: Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature…
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Q: Calculate the age of the universe if the Hubble's constant was 29.45 km-s¹ Mly''.
A: It is observed that the galaxies in our universe are moving away from each other. This expansion of…
Q: Galaxy A is measured to have a smaller cosmological redshift than Galaxy B. Which galaxy is farther…
A: Redshift: It is stated as the change in the frequency of the light and is used to study the position…
Q: (a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…
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Q: Using Ho = = 20.8 km/s/Mly and assuming the expansion rate has been constant, find out how long the…
A: It is observed that the galaxies in our universe are moving away from each other. This expansion of…
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: 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: By what factor would the critical density of the universe today change if the Hubble constant today…
A: Understanding the critical density of the universe is pivotal in unraveling its composition. The…
- As per Hubble's law, the universe is expanding and the velocity of recession of a galaxy is proportional to its distance from the observer.
- From Hublles law we can calculate the age of expansion. This time known as Hubble time is given by,
Here H0 is the Hubble's constant.
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