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.
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 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)....
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 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...
1. The critical temperature and pressure of water are 647.1 K and 217.7 atm. For a sample of steam just below its critical point, 600.0 K and 200.0 atm, a. Calculate the number density. b. Calculate the mean free path. Assume the diameter of a water molecule is 0.15 nm. c. Compare these results to those for air at 1 atm and 298 K. d. Calculate the average speed of water molecules under these conditions, e. Calculate the collision frequency...
The magnetic field in the interstellar space of our galaxy has a magnitude of about 2.53 × 10-10 T. How much energy is stored in this field in a cube 12.3 light‐years on edge? (For scale, note that the nearest star is 4.3 light‐years distant and the radius of the galaxy is about 8 × 104 light‐years.)