Interstellar space has an average temperature of about 10 K , and an average density of...
Interstellar space has an average temperature of about 10 K , and an average density of hydrogen atoms of about one hydrogen atom per cubic meter. Calculate the mean free path of hydrogen atoms in interstellar space. Use ?=100 pm as the diameter of a hydrogen atom.
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Interstellar space has an average temperature of about 10 K ,
and an average density of...
The energy density of starlight in interstellar space is 10–15 J/m3. If the average wavelength of...
The energy density of starlight in interstellar space is
10–15 J/m3. If the average wavelength of
starlight is 500 nm, what is the corresponding density of photons
per cubic meter of space? (photons/m3)
photons/m3
Looking for assistance on the problem. I have come to a few answers but would like...
Looking for assistance on the problem. I have come to a few answers
but would like a second opinion. Thanks!
In interstellar space there are clouds of cold gas (at about 20 K) called dark nebula because they block the light from stars behind them from reaching Earth. A typical diameter fro a dark nebula is about 20 light years and has a density of monatomic hydrogen of 50 hydrogen atoms per cubic centimeter. a.) Estimate the mean free path...
Question 1: Interstellar space is not actually a perfect vacuum. Turns out there are clouds of...
Question 1: Interstellar space is not actually a perfect vacuum. Turns out there are clouds of atoms that roam these regions of space that are loosely held together by their combined gravity. Suppose there is a cloud with a number density of about 100 atoms/cm3 of neutral Hydrogen far away from any stars, bt with in the Milky Way galaxy. The temperature in this cloud is 100 KAsme each hydrogen atom is a hard sphere of radius 0.529 A (angstroms)....
6. The average body temperature of a healthy person is 37.0°C. Boltzmann's constant is 1.38 ×...
6. The average body temperature of a healthy person is 37.0°C. Boltzmann's constant is 1.38 × 10−23 J/K. If a fever increases the temperature to 38.6°C, by what percentage does the average kinetic energy of the molecules increase? 7. In intergalactic space, there is an average of about one hydrogen atom per cubic centimeter and the temperature is 6.10 K. What is the absolute pressure? Boltzmann constant is 1.38 × 10−23 J/K. (answer is in Pa)
8. 5pt Suppose you gathered a ball of interstellar gas that was equal to the size...
8. 5pt Suppose you gathered a ball of interstellar gas that was equal to the size of the Earth (a radius of about 6400 km). If this gas has a density of 3.8 hydrogen atoms per cm3, typical of the interstellar medium, what would its total mass be? The volume of a sphere is (For comparison, a bowling ball has a mass of about 5 kg) 9. [5pt] At the average density of of a star-forming molecular cloud, about 880...
Three moles of a helium gas are at a temperature of 435 K. Calculate the average...
Three moles of a helium gas are at a temperature of 435 K. Calculate the average kinetic energy per atom, the root-mean-square (rms) speed of atoms in the gas, and the internal energy of the gas. (a)the average kinetic energy per atom (in J) B.) the root-mean-square (rms) speed (in m/s) of atoms in the gas C.) The internal energy of the gas (in J)
2) Silver has a density of 10.5 x 103 kg/m3 and a resistivity of 1.60 x...
2) Silver has a density of 10.5 x 103 kg/m3 and a resistivity of 1.60 x 10-8 m at room temperature. (a) On the basis of the classical free electron gas model, and assuming that each silver atom contributes one electron to the electron gas, calculate the average time between collisions of the electrons. (b) Calculate the mean free path from t and the electron's thermal velocity. (c) How does the mean free path compare to the lattice spacing?
q 8.3 Show that particles hitting a plane boundary have travelled a distance 2 lambda/3 perpendicular...
q 8.3
Show that particles hitting a plane boundary have travelled a distance 2 lambda/3 perpendicular to the plane since their last collision, on average. A diffuse cloud of neutral hydrogen atoms in space has a temperature of 50 K and number density 500 cm^-3. Estimate the mean scattering time (in years) between hydrogen atoms in the cloud. Estimate the mean free path (in astronomical units).
In a certain particle accelerator, protons travel around a circular path of diameter D in an evacuated chamber, whose residual gas is at temperature T and pressure p. Assuming T is given in Kelvin an...
In a certain particle accelerator, protons travel around a circular path of diameter D in an evacuated chamber, whose residual gas is at temperature T and pressure p. Assuming T is given in Kelvin and p in pascals, calculate the number n of gas molecules per cubic meter under these conditions, what is the mean free path λ of the gas molecules if the molecular diameter is d. State your answers in terms of the given variables, using the Boltzmann...
During a physics experiment, helium gas is cooled to a temperature of 13.0 K at a...
During a physics experiment, helium gas is cooled to a temperature of 13.0 K at a pressure of 7.00×10−2 atm . Part A What is the mean free path in the gas? Express your answer with the appropriate units. Part B What is the rms speed of the atoms? Express your answer with the appropriate units. Part C What is the average energy per atom? Express your answer with the appropriate units.
The energy density of starlight in interstellar space is
10–15 J/m3. If the average wavelength of
starlight is 500 nm, what is the corresponding density of photons
per cubic meter of space? (photons/m3)
photons/m3
Looking for assistance on the problem. I have come to a few answers
but would like a second opinion. Thanks!
In interstellar space there are clouds of cold gas (at about 20 K) called dark nebula because they block the light from stars behind them from reaching Earth. A typical diameter fro a dark nebula is about 20 light years and has a density of monatomic hydrogen of 50 hydrogen atoms per cubic centimeter. a.) Estimate the mean free path...
Question 1: Interstellar space is not actually a perfect vacuum. Turns out there are clouds of atoms that roam these regions of space that are loosely held together by their combined gravity. Suppose there is a cloud with a number density of about 100 atoms/cm3 of neutral Hydrogen far away from any stars, bt with in the Milky Way galaxy. The temperature in this cloud is 100 KAsme each hydrogen atom is a hard sphere of radius 0.529 A (angstroms)....
8. 5pt Suppose you gathered a ball of interstellar gas that was equal to the size of the Earth (a radius of about 6400 km). If this gas has a density of 3.8 hydrogen atoms per cm3, typical of the interstellar medium, what would its total mass be? The volume of a sphere is (For comparison, a bowling ball has a mass of about 5 kg) 9. [5pt] At the average density of of a star-forming molecular cloud, about 880...
2) Silver has a density of 10.5 x 103 kg/m3 and a resistivity of 1.60 x 10-8 m at room temperature. (a) On the basis of the classical free electron gas model, and assuming that each silver atom contributes one electron to the electron gas, calculate the average time between collisions of the electrons. (b) Calculate the mean free path from t and the electron's thermal velocity. (c) How does the mean free path compare to the lattice spacing?
q 8.3
Show that particles hitting a plane boundary have travelled a distance 2 lambda/3 perpendicular to the plane since their last collision, on average. A diffuse cloud of neutral hydrogen atoms in space has a temperature of 50 K and number density 500 cm^-3. Estimate the mean scattering time (in years) between hydrogen atoms in the cloud. Estimate the mean free path (in astronomical units).
In a certain particle accelerator, protons travel around a circular path of diameter D in an evacuated chamber, whose residual gas is at temperature T and pressure p. Assuming T is given in Kelvin and p in pascals, calculate the number n of gas molecules per cubic meter under these conditions, what is the mean free path λ of the gas molecules if the molecular diameter is d. State your answers in terms of the given variables, using the Boltzmann...
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