Xenon-124 has the longest half-life of 1.8 x 1022 years. Assuming that xenon-124 was created 12 billion years ago calculate the current ratio of xenon-124 present in the universe.

Q: Assume a flat FRW universe, dominated by radiation throughout its history. Calculate the physical,…

A: The objective of the question is to calculate the physical, cosmological horizon size at a given…

Q: The matter density in the Universe today is ?m=2.7×10−27kgm−3. What would be the value of the…

A: Given that the matter density in the Universe today is 2.7×10-27 kg/m3 and the Hubble constant is 38…

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Q: Suppose that the universe were full of spherical objects, each of mass m and radius r . If the…

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Q: Suppose that the universe were full of spherical objects, each of mass m and radius r . If the…

A: Given:  Mass of one spherical ball = 4 kg radius of the one spherical ball = 0.0407 m Spherical…

Q: The mass of the neutrino plays an important role in the universe. Suppose the mass of two neutrinos…

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Q: The present number density of electrons in the Universe is the same as that of protons, about 0.2…

A: The present number density of electrons = 0.2m-3. Long before the formation of microwave background,…

Q: Where did all the antimatter go?

A: Anti-particle came into light in the 20th century when famous physicist Paul Dirac was trying to…

Q: What is the estimated age of the Universe (in years) if the Hubble constant is 70 km/s/Mpc?

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Q: According to the version of the Big Bang Theory without a Cosmological Constant (and without Dark…

A: Hubble's Law states that as the universe is expanding in all directions, the receding velocity of an…

Q: Assume a flat Friedmann-Robertson-Walker universe. Calculate the redshift z at which the temperature…

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Q: Recent findings in astrophysics suggest that the observable universe can be modeled as a sphere of…

A: It is given that,

Q: Give an Example of one cosmogenic nuclide (decay equation producing that nuclide), Give example of…

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Q: Where did the values for (T - 20 C) come from?

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Q: Suppose that the universe were full of spherical objects, each of mass m and radius r . If the…

A: Critical density is the average density required for the universe to halt its expansion. Such a…

Q: (a) What Hubble constant corresponds to an approximate age of the universe of 1010 y? To get an…

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Q: Why couldn't atomic nuclei exist when the age of the universe was less than 2 minutes?

A: As per Hubble's theory, the universe is expanding, this means at some point in time there were…

Q: What would be your estimate for the age of the universe if you measured Hubbleʹs constant to be 33…

A: We are given the value of Hubble constant. We are to find the age of universe. We are also given the…

Q: If the universe had a density equal to its estimated critical density of 9= 10-30 g/cm3, and if it…

A: Given Critical density ρc =  9×10-30 g/cm3 Mass  (M)                 = 2.0 × 1030 kg

Q: If the current mass of the universe consists of 75% protons and 25% 4He, what is the current ratio…

A: Given: Universe consists of 75% protons and 25% 4He.

Q: What is the estimated age of the Universe (in years) if the Hubble constant is 80 km/s/Mpc?

A: Hubble constant (H) = 80 kms-MpcUsing , 1 Pc = 3.08×1016 m= 80×1000 ms×106×3.08×1016 m = 2.59×10-18…

Q: How can I calculate the following:  Therefore what fraction of those created at a height of 45…

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Q: I don’t understand how that it was estimated as length of a mouse is 4 to 15 cm in length. Is that a…

A: Given estimated length of mouse is 4cm to 15cm

Q: uppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has a…

A: Given values, mass of the cruise ship(m) =3.1×108 kgkinetic energy of speed of light=13%light of…

Q: C^14, a form of carbon that is used to find the age of fossils has a half life of 5730 years. how…

A: Given(s): Initial sample, N0=10 g. Half-life, t12=5730 yr Time, t=13,000 yr. Require: Amount of…

Q: What does p/T represent? Where T is life time holes per second lost time holes

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Q: where did the 50 x 10^-3 come from and how did you get the math of -7.5

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Q: The Universe is approximately 13.8 Billion years old. What is the volume of the visible universe in…

A: Age of universe = 13.8 billion year Distance travel by light in 13.8 billion light year is.…

Q: Suppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has…

A: Since the ship is moving with 13% of the speed of light (0.13c), we can apply relativistic equation…

Q: What is the estimated age of the Universe (in years) if the Hubble constant is 60 km/s/Mpc?

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