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1. [Cosmic background temperature] At present, the cosmic background radiation is at 3 K. Suppose...
The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. What...
The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. What is the peak wavelength of this radiation? The constant in Wien's law is 0.0029 m ∙ K. Hint: the answer will be in mm
In the present theory of the Big Bang, what significant event occurred at about 400,000 years...
In the present theory of the Big Bang, what significant event occurred at about 400,000 years after the universe started expanding? The primordial helium in the universe was produced. The universe became transparent to neutrinos. The temperature of the cosmic background radiation had cooled to its present level of about 3 K. The universe became transparent to photons of radiation.
For photons in equilibrium at temperature Tin a cavity of volume V, Eq. (7.20) gives the number of photons with circula...
For photons in equilibrium at temperature Tin a cavity of volume V, Eq. (7.20) gives the number of photons with circular frequency in the range ω to ω + do. 3. (a) Show that the total number of photons in equilibrium at temperature T in a cavity of volume Vis 2.40V kT ће Cite any reference you use to evaluate the integral. Credit will be given for evaluating it yourself. Hint: You might make use of the Riemann zeta functions...
Please make sure you give me the correct answer 13) The cosmic background radiation permeating the...
Please make sure you give me the correct answer
13) The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. The energy density of deep space is 4.19 x 10-8 J/cm3 a, What is the peak wavelength of this radiation? b, Assuming the energy density of space is from these photons, how many photons are there on average in each cubic centimeter of space?
Questions Chapter 17 - Set 2 1. Why was the discovery of cosmic background radiation from...
Questions Chapter 17 - Set 2 1. Why was the discovery of cosmic background radiation from all over the sky heralded as strong evidence in favor of the big bang theory? 2. Big bang cosmology involves some mind-bending concepts. Imagine that you are talking to a curious and intelligent 13-year-old cousin. Try to convey the following ideas as clearly as you can. Explain how we can look back in time by observing distant objects. 3. Explain how the physical universe...
Weeks 5, 6: How is Olber's paradox solved? Does the Universe have a center or an edge? What is th...
Weeks 5, 6: How is Olber's paradox solved? Does the Universe have a center or an edge? What is the cosmological principle? The Universe expands: why, how, and how do we know? What is cosmological redshift? What is the Big Bang? How old/big/fast is the Universe? How do Hubble's constant, the critical density of the flat universe, and the density parameter help us understand those properties of the Universe? What is the cosmic light horizon and why is it the...
Suppose 1.50 m^3 of a gas with = 1.40, initially at 300 K and 1.0 atm,...
Suppose 1.50 m^3 of a gas with = 1.40, initially at 300 K and 1.0 atm, is suddenly compressed adiabatically to one half of its initial volume. (1 atm = 101.3 kPa). Find its final pressure final temperature
h) Radiocarbon testing: 1C occurs naturally from neutron bombardment of 14N due to cosmic radiation. 1C...
h) Radiocarbon testing: 1C occurs naturally from neutron bombardment of 14N due to cosmic radiation. 1C is unstable and decays by beta emission, with a half-life of 5730 yr. Bombardment or transmutation reactions are listed in shorthand as "original nucleus (particle in, particle out) new nucleus." Complete the two nuclear reactions involved: 14,C 14,N ( C 14,N+on + or 146C Background: The ratio of 1"C to 12C has been relatively constant on earth (about 1 atom in a trillion atoms...
Calculate the rate of energy loss due to thermal radiation from an unclothed person if the average skin temperature is...
Calculate the rate of energy loss due to thermal radiation from an unclothed person if the average skin temperature is 37 °C and the room temperature is 20 °C. You may sume a total surface area of 1.5 m and a skin emissivity value of 0.9. How much energy (from food) must be consumed per day to compensate for this loss? If the person is surrounded by a layer of insulation of thickness 1.0 cm with a thermal conductivity of...
S Q. Find the entropy and/or temperature of steam at the following states Region k/kg K) 5 MPa 1 ...
s Q. Find the entropy and/or temperature of steam at the following states Region k/kg K) 5 MPa 1 MPa 18 MPa 400°C 40 kPa 40 kPa 120°C 50°C Quality, x-09, Mixed 71794 (<7.6700) Q. Determine the entropy change of water contained in a closed system as it changes phase rom saturated liquid to saturated vapor when the pressure is 0.1MPa and constant Why is the entropy change positive for this process? 2. Steam at 1 MPa, 6000C expands in...
In the present theory of the Big Bang, what significant event occurred at about 400,000 years after the universe started expanding? The primordial helium in the universe was produced. The universe became transparent to neutrinos. The temperature of the cosmic background radiation had cooled to its present level of about 3 K. The universe became transparent to photons of radiation.
For photons in equilibrium at temperature Tin a cavity of volume V, Eq. (7.20) gives the number of photons with circular frequency in the range ω to ω + do. 3. (a) Show that the total number of photons in equilibrium at temperature T in a cavity of volume Vis 2.40V kT ће Cite any reference you use to evaluate the integral. Credit will be given for evaluating it yourself. Hint: You might make use of the Riemann zeta functions...
Please make sure you give me the correct answer
13) The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. The energy density of deep space is 4.19 x 10-8 J/cm3 a, What is the peak wavelength of this radiation? b, Assuming the energy density of space is from these photons, how many photons are there on average in each cubic centimeter of space?
Questions Chapter 17 - Set 2 1. Why was the discovery of cosmic background radiation from all over the sky heralded as strong evidence in favor of the big bang theory? 2. Big bang cosmology involves some mind-bending concepts. Imagine that you are talking to a curious and intelligent 13-year-old cousin. Try to convey the following ideas as clearly as you can. Explain how we can look back in time by observing distant objects. 3. Explain how the physical universe...
Weeks 5, 6: How is Olber's paradox solved? Does the Universe have a center or an edge? What is the cosmological principle? The Universe expands: why, how, and how do we know? What is cosmological redshift? What is the Big Bang? How old/big/fast is the Universe? How do Hubble's constant, the critical density of the flat universe, and the density parameter help us understand those properties of the Universe? What is the cosmic light horizon and why is it the...
Suppose 1.50 m^3 of a gas with = 1.40, initially at 300 K and 1.0 atm, is suddenly compressed adiabatically to one half of its initial volume. (1 atm = 101.3 kPa). Find its final pressure final temperature
h) Radiocarbon testing: 1C occurs naturally from neutron bombardment of 14N due to cosmic radiation. 1C is unstable and decays by beta emission, with a half-life of 5730 yr. Bombardment or transmutation reactions are listed in shorthand as "original nucleus (particle in, particle out) new nucleus." Complete the two nuclear reactions involved: 14,C 14,N ( C 14,N+on + or 146C Background: The ratio of 1"C to 12C has been relatively constant on earth (about 1 atom in a trillion atoms...
Calculate the rate of energy loss due to thermal radiation from an unclothed person if the average skin temperature is 37 °C and the room temperature is 20 °C. You may sume a total surface area of 1.5 m and a skin emissivity value of 0.9. How much energy (from food) must be consumed per day to compensate for this loss? If the person is surrounded by a layer of insulation of thickness 1.0 cm with a thermal conductivity of...
s Q. Find the entropy and/or temperature of steam at the following states Region k/kg K) 5 MPa 1 MPa 18 MPa 400°C 40 kPa 40 kPa 120°C 50°C Quality, x-09, Mixed 71794 (<7.6700) Q. Determine the entropy change of water contained in a closed system as it changes phase rom saturated liquid to saturated vapor when the pressure is 0.1MPa and constant Why is the entropy change positive for this process? 2. Steam at 1 MPa, 6000C expands in...
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