UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 25, Problem 35Q
(a)
To determine
The reason due to which the
(b)
To determine
The radiation temperature at
(c)
To determine
The redshift at which the radiation temperature is equal to 293 K, if it is given that a proton of wavelength
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Chapter 25 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
Ch. 25 - Prob. 1CCCh. 25 - Prob. 2CCCh. 25 - Prob. 3CCCh. 25 - Prob. 4CCCh. 25 - Prob. 5CCCh. 25 - Prob. 6CCCh. 25 - Prob. 7CCCh. 25 - Prob. 8CCCh. 25 - Prob. 9CCCh. 25 - Prob. 10CC
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- Show that no matter how big a redshift (z) we measure, v/c will never be greater than 1. (In other words, no galaxy we observe can be moving away faster than the speed of light.)arrow_forwardAn astronaut takes a trip to Sirius, which is located a distance of 8 light-years from the Earth. The astronaut measures the time of the one-way journey to be 6 years. If the spaceship moves at a constant speed of 0.8c, how can the 8-ly distance be reconciled with the 6-year trip time measured by the astronaut?arrow_forwardThe Klein-Gordon equation at background level for a scalar field φ is given by (found in image below) where H is the Hubble parameter, V the potential of the scalar field, and V′ = dV/dφ.Assume a flat Friedmann-Robertson-Walker universe, dominated by the scalar field.i) State the conditions for slow-roll inflation. Write down the Friedmann equation and theKlein-Gordon equation valid for slow-roll inflation.ii) For a scalar field potential V =1/2m^2φ^2, where m is the mass of the field, calculate thetime evolution of the field φ in the case of slow-roll inflation.arrow_forward
- Suppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has a mass of 4.3 x 108kg. Consider the Kendrick energy required at 17% of the speed of light. If energy to get a spaceship to cruising speed is generated using matter-antimatter annihilation, what mass of antimatter in kg is required ?arrow_forwardThe Milky Way has a diameter (proper length) of about 1.2 x 105 light-years. As far as an astronaut is concerned, how long (in years) would it take to cross the Milky Way, if the speed of the spacecraft is 0.99999 c?arrow_forwardIn the context of relativity, what is an "event"? Give a specific example of an event and provide the coordinates necessary to specify the event.arrow_forward
- 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_forwardAccording to the Big Bang Theory, order from earliest to latest, the sequence of events that are thought to have taken place at the beginning of the Universe. If statement A is first, B is second, etc. then enter ABCDEF.A) The universe becomes transparent releasing the photons of the Cosmic Microwave Background.B) Most carbon and oxygen in the Universe is produced.C) Inflation occurs.D) Hydrogen and Helium are synthesized.E) The symmetry of the four forces is broken and gravity becomes a separate force.F) Protons and anti-protons form.arrow_forwardWhat would be the critical density of matter in the universe if the value of the Hubble constant were (a) 40 km/sec/ Mpc? (b) 90 km/sec/Mpc?arrow_forward
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