Modern Physics
3rd Edition
ISBN: 9781111794378
Author: Raymond A. Serway, Clement J. Moses, Curt A. Moyer
Publisher: Cengage Learning
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Chapter 16, Problem 13P
(a)
To determine
To prove that the age of the universe is equal to inverse of Hubble’s constant.
(b)
To determine
The value of
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If the average density of the Universe is small compared with the critical density, the expansion of the Universe described by Hubble's law proceeds with speeds that are nearly constant over time.
Calculate t since the big bang, assuming H = 22.0 km/s/Mly.
Because of the cosmological expansion, a particular emission from a distant galaxy has a wavelength that is 2.00 times the wavelength that emission would have in a laboratory. Assuming that Hubble’s law holds and that we can apply Doppler-shift calculations, what was the distance (ly) to that galaxy when the light was emitted?
What mechanism can simultaneously solve both the flatness and horizon problems in cosmology?
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- An electron jumps from n=3 to n=2 in a hydrogen atom in a distant galaxy, emitting light. If we detect that light at a wavelength of 3.00 mm, by what multiplication factor has the wavelength, and thus the universe, expanded since the light was emitted?arrow_forwardBy what factor would the critical density of the universe today change if the Hubble constant today measured at 5 times greater than what we previously thought?arrow_forwardAssuming the matter temperature equalled the radiation temperature at the recombinationepoch, evaluate MJ in a Friedmann universe of a given (h0, Ω0) with the present temperatureT0 = 3K of the microwave background.arrow_forward
- The quark flavor change d → u takes place in β− decay. Does this mean that the reverse quark flavor change u → d takes place in β+ decay? Justify your response by writing the decay in terms of the quark constituents, noting that it looks as if a proton is converted into a neutron in β+ decay.arrow_forwardEdwin Hubble observed that the light from very distant galaxies was redshifted and that the farther away a galaxy was, the greater its redshift. What does this say about very distant galaxies? When Hubble first estimated the Hubble constant, galaxy distances were still very uncertain, and he got a value for H of about 600 km/s per Mpc. What would this have implied about the age of the universe? What problems would this have presented for cosmologists?arrow_forwardAccording to thermodynamic equilibrium, which should be the most abundant and least abundant quarks during the period from 10-13 s to 10 -3 s?arrow_forward
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