Question 32 The horizon problem concerns O the inability to see more than about 10,000 LY inside our galaxy O the inability to see a level horizon from observatories O the isotropy of the Cosmic Microwave Background O none are correct

Q: 1- As the universe expands, a galaxy which is at a distance of  5.0 x 106 pc, is moving away from…

A: Hello. Since you have posted multiple questions and not specified which question needs to be solved,…

Q: critical density

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Q: Consider a neutron star of radius of 10 km and a mass of 1.4 M⊙ that has a surface layer of pure 1H.…

A: Given; Radius,R=10km=10×103mMass of a neutron star,mS=1.4×1.98×1030kgWein's…

Q: If the smallest meaningful time interval is greater than zero, will the lines in Figure 34.9 ever…

A: Given: In figure, the two lines are approaching each other and the one line is moving from right to…

Q: What mechanism can simultaneously solve both the flatness and horizon problems in cosmology?

A: What mechanism can simultaneously solve both the flatness and horizon problems in cosmology

Q: 3. The formula for Hubble's Law using the velocity v is valid only for velocities much smaller than…

A: Given data: Redshift z=4.89. The recessional velocity is given as,  v=cz+12-1z+12+1 Here, c is the…

Q: Estimate the mass contained in the Milky Way galaxy blackhole.

A: Schwarzschild radius also known as the gravitational radius is the limit to which an object can…

Q: a) Define the term “standard candle” as used in cosmology b). The flux is defined as f(Dlum) = L…

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Q: Observations of distant galaxies show O they appear older than they really are. the size of the…

A: We are able to observe  because of light reach us from the stars.

Q: What is the event horizon radius [m] for the sun if it were to collapse to a Schwarzschild black…

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Q: A galaxy is observed to recede from Earth with an approximate speed of 0.81c. Approximately how…

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Q: 10. An proton-antiproton pair is produced by a 1.95 x 10° MeV photon. What is the kinetic energy of…

A: Kp'= 1950 - [55.35 + 938] - 938 Kp' = 1950 - [993.35] -938 Kp' = 1950 - 1931.35 Kp'= 18.65 Mev

Q: 3. Determine the Schwartzschild radius and the average density of a black hole formed by the…

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Q: Canopus, which is in the constellation of Carina and Argo Navis, is 310 ly away. You plan a…

A: Given data: D = 310 ly Need to determine the vacation destination distance.

Q: We know that dark matter must exist in galaxies. If not, many of the stars in a galaxy would ...…

A: Dark Matter is an unknown matter which is not visible. The reason behind its invisibility is, it…

Q: Recall that Hubbleʹs law is written v = H0d, where v is the recession velocity of a galaxy located a…

A: Given data: Hubble's constant (H0) = 80 km/s/Mpc Distance (d) = 800 Mpc Required: Recession velocity…

Q: 5.4 In a negatively curved universe containing only matter (2, < 1, K = -1), show that the present…

A: Given, the universe contains only matter and Ωo&lt;1 So scale factor will be a=12ΩoΩo-1coshθ-1…

Q: Problem 3. Consider a flat, single component universe. 1. For a light source at redshift z that is…

A: Given a flat single-component universe.   1.)   The Hubble parameter is defined by…

Q: What started the clumping of matter in the early universe that eventually became the seeds of…

A: The force that is carried by the field of virtual astronomical particles in the quantum field is…

Q: 9. In an experiment to measure the mass of the negative K meson (kaon) the photon energy for the…

A: Let Z be defined as the atomic number of the nucleus around which Kaon is moving in a circular…

Q: n. Estimate the relative velocity.

A: Given: Lo=2m L=0.75m To find: Relative velocity

Q: If the Large Hadron Collider is 27 km long, and visible light travels 3.0 x 108 m/s, how long does…

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Q: At what redshift will the Lya line (2o = 1215°A) be centered in the Johnson-Cousins U band? (Quasars…

A: From the redshift formula, we have  1+z=λobsλemitz=redshiftλobs=obserevd…

Q: *39 Will the universe continue to expand forever? To attack this question, assume that the theory of…

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Q: Time period of rotation of a blackhole is 5.52 milliseconds. What is the frequency of rotation in SI…

A: Given data: Time period of rotation of a blackhole is, T=5.52 ms=5.52×10-3 s.

Q: What strong evidence found in the mid-1960s led to wide acceptance of the big bang theory of the…

A: We need to find the evidence that led to wide acceptance of the big bang theory of the universe.

Q: Suppose that a galaxy has 109 M⊙ of neutral HI gas with a temperature of about 10 K. Estimate the…

A: Given Data: The mass of the galaxy is, M = 109 M Temperature about 10k The luminosity of the 21cm…

Q: What effect does increasing the interaction strength of a massive particle species have on its…

A: The thermal relic abundance of a particle species is determined by the balance between its…

Q: If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV,…

A: The increasing order of the wavelength of electromagnetic radiation is given by  gamma rays x rays…

Q: 3. Consider the following two universes: Universe I: flat, matter-dominated with no cosmological…

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Q: Suppose you wanted to measure the distance to an elliptical galaxy around 5 Mpc away using variable…

A: Given: To measure the distance in an elliptical galaxy having 5 Mpc used as the variable stars. To…

Q: The hydrogen Balmer line Hγ has a wavelength of 434.0 nm in the laboratory. It is observed in a…

A: Quasi-stellar objects or quasars are the distant objects in the universe. They are hard to detect…

Q: A galaxy is moving away from Earth. The "blue" hydrogen line at 434 nm emitted from the galaxy is…

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Q: Which of the following might you expect to be an additional consequence of the fact that galaxies…

A: Given Which of the following might you expect to be an additional consequence of the fact that…

Q: Use Wien’s law to answer the following questions: (a) The cosmic background radiation peaks in…

A: According to Wien’s law, The temperature in this case can be obtained as

Q: a)Define the term “standard candle” as used in cosmology.  b)The flux is defined asf(Dlum) =…

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Q: IV-(v) We have a gas of fermions and another gas of bosons, Their densities (number of particle per…

A: Here given densities of gas of fermions and gas of bosons are same.   We have to purpose…

Q: QUESTION 6 A galaxy is discovered at a distance of 11 billion light-years from our solar system. We…

A: Here, We are given that a galaxy is discovered at a distance of 11 billion light - years from our…

Q: The hydrogen Balmer line Hβ has a wavelength of 486.1 nm in the laboratory. It is observed in a…

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Q: If Hubble’s constant is taken to be 70 km/sec/Mpc, and a quasar is found with a radial velocity of…

A: Given data: The Hubble’s constant is H0=70 km/sec/Mpc. The radial velocity is v=0.95c.

Q: 46 Figure 44-12 is a hypothetical plot of the recessional speeds v of galaxies against their…

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Q: Consider the following stellar spectra from the sun and from a supercluster of galaxies. ABSORPTION…

A: Given information: The absorption spectrum of the Sun compared to the Super-cluster of galaxies:

Q: The fact that many radio lobes emit less intensely on the side of the galaxy facing away from Earth…

A: Answer e. they are created by jets of high-speed matter in magnetic fields, which tend to emit…

Q: A black hole in the center of a nearby Galaxy has a Schwarzchild radius of 2.0*10^7 km. How many…

A: Given : - A black hole in the center of a nearby Galaxy has a Schwarzschild radius of 2.0*10^7 km…

Q: 2. Determine the Schwarzschild radius and the average density of a black hole formed by the…

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