Guess scale factor of the universe

Reference no: EM133671

Question

Assume early universe was composed only of Helium instead of Hydrogen.

a) Estimate the temperature of CMB when Helium recombination occurred. Suppose that all the CMB photons have the average energy of the black body spectrum.

b) Repeat your approximation of the temperature, but now assume that you only need 1 photon per Helium atom to keep the atoms ionized. Also suppose fraction of photons with energy greater than E in a black body spectrum is approximately, exp (-E/kT)

c) guess scale factor of the Universe when Helium recombination occurred using your two different answers in part a and b.

Reference no: EM133671

Questions Cloud

What is final speed of the block : What is final speed of the block

What is magnitude of the momentum : What is magnitude of the momentum

How much indirect factory wages : How much indirect factory wages and factory equipment depreciation cost could be assigned to the Customer Orders activity cost pool?

Explain the term marketing channel : Explain the term Marketing Channel Distinguish between exclusive, intensive and selective distribution strategy

Guess scale factor of the universe : Guess scale factor of the Universe

How much overhead may be allocated each time : How much overhead may be allocated each time a copy is made if cost allocations are computed to 4 significant digits?

What frequency will hear after the train passes : What frequency will hear after the train passes

Discover the magnetic field on the z axis : Discover the magnetic field on the z axis What happens if the block is immersed in carbon disulfide

Write notes on marijuana and cannabis compounds : Smoking is hazardous to health. Justify this statement by referring to cardiovascular diseases, cancer and respiratory diseases. As a counsellor what techniques would you use to promote smoking cessation Write notes on- (a) Marijuana and Cann..

Reviews

Write a Review

Required(*) Message

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

Submit Assignment

User Account

All Pages