Question

In: Physics

How dense was the universe when it was 1 million years old?

How dense was the universe when it was 1 million years old?

Solutions

Expert Solution

The Big Bang Model postulates that the density of the universe was infinity just when the big bang started. It became finite and reduced gradually as the universe expanded. There are three era in the Big Bang hypothesis: Radiation Era, Matter Era and Dark Energy Era. The early universe was dominated by radiation. Radiation Era is the time when radiation dominated in the universe. The Matter Era is the time when matter dominated in the universe. The Dark Energy Era is the time when the Dark Energy dominated in the universe.

Radiation era lasts from 0s to . At the end of the radiation era, density of the universe is . In the first epoch of matter era, which lasts from to , density of the universe changes from to . The time 1 million years lies in this epoch and by intrapolation, we can approximate the density at time to be around . Thus, the universe was approximately dense when it was 1 million years old.

genius_generous answered 2 years ago
Next > < Previous

Related Solutions

You are 20 years old and you want to retire when you have saves$1 million....
You are 20 years old and you want to retire when you have saves $1 million. You have inherited $250,000 and will not add any other savings to that amount. The money will be conservatively invested at 6% per annum. At what age will you be able to retire a millionaire?
. If you die when you are 90 years old, how much money will be left...
. If you die when you are 90 years old, how much money will be left to bequeath?
For 1 kg of liquid water, determine the entropy change of the universe when the water...
For 1 kg of liquid water, determine the entropy change of the universe when the water is: Initially at 0 C, is heated to 50 C by contact with a thermal reservoir at 50 C and then to 100 C with a thermal reservoir at 100 C Assume Cp = 4.2 kJ/kg-K
Mildred and Georgia are both 40 years old. When mildred was 25 years old she began...
Mildred and Georgia are both 40 years old. When mildred was 25 years old she began depositing $1000 a year into a retirement account which averaged 5% APR. She made deposits for the first 10 years, at which point she was forced to stop making deposits. However, she left her money in the account where it continues to earn 5% interest. Georgia didn't start thinking about saving for retirement until now. How much money must she invest per year until...
1. Expansion of the Universe (Hubble) a) Would the Universe be older if the expansion rate...
1. Expansion of the Universe (Hubble) a) Would the Universe be older if the expansion rate was H0 = 50 km/s/Mpc or if H0 = 75 km/s/Mpc? Explain. b) What is the age of the Universe if the Hubble constant is measured to be 75 km/s/Mpc? Express your answer in billions of years. Would this value be consistent with the range for the Hubble time from the HST Key Project? Explain. c) On average, how do the velocities of far...
You are now 25 years old. You would like to retire when you are 65 years old.
You are now 25 years old. You would like to retire when you are 65 years old. You want to receive starting at 65 an annual income of $150,000 per year until you are 95. How much money must you have in your retirement account when you are 65? Assume you can earn 4% per annum.
1- ) You want to have $3 million when you retire in 40 years. If you...
1- ) You want to have $3 million when you retire in 40 years. If you can earn 12% per year, how much do you need to deposit on a monthly basis if the first payment is made in one month? 2- ) What if the first payment is made today? 3- ) You are considering ABC’s preferred stock that is expected to pay a quarterly dividend of $1.00 forever. If your desired return is 10% per year, how much...
On January 1, 2021, Universe of Fun issues $700,000, 7% bonds that mature in 10 years....
On January 1, 2021, Universe of Fun issues $700,000, 7% bonds that mature in 10 years. The market interest rate for bonds of similar risk and maturity is 8%, and the bonds issue for $652,434. Interest is paid semiannually on June 30 and December 31. Record the issuance of the bonds on January 1, the interest payments on June 30, and December 31, 2021. 1) Record the bond issue. 2) Record the first semiannual interest payment. 3) Record the second...
Jason is 11 years old and has Type 1 Diabetes. He was diagnosed with Diabetes when...
Jason is 11 years old and has Type 1 Diabetes. He was diagnosed with Diabetes when he was 5 years old. He is comfortable taking his "blood sugar" readings during the day. He likes to participate in sports and is on the soccer team, which practices three times a week after school. His mother always packs his lunch for school so he does not have to worry about eating the food in the cafeteria. For this written assignment plan a...
Jason is 11 years old and has Type 1 Diabetes. He was diagnosed with Diabetes when...
Jason is 11 years old and has Type 1 Diabetes. He was diagnosed with Diabetes when he was 5 years old. He is comfortable taking his "blood sugar" readings during the day. He likes to participate in sports and is on the soccer team, which practices three times a week after school. His mother always packs his lunch for school so he does not have to worry about eating the food in the cafeteria. For this written assignment plan a...
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT