Chapter 20: Q. 26 (page 567)
A sample of neon gas has of thermal energy. Estimate the average speed of a neon atom.
Short Answer
The average spped of a neon atom is
Chapter 20: Q. 26 (page 567)
A sample of neon gas has of thermal energy. Estimate the average speed of a neon atom.
The average spped of a neon atom is
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Get started for freeEquation is the mean free path of a particle through a gas of identical particles of equal radius. An electron can be thought of as a point particle with zero radius.
a. Find an expression for the mean free path of an electron through a gas.
b. Electrons travel through the Stanford Linear Accelerator. In order for scattering losses to be negligible, the pressure inside the accelerator tube must be reduced to the point where the mean free path is at least . What is the maximum possible pressure inside the accelerator tube, assuming Give your answer in both and .
At what temperature does thespeed of a nitrogen molecule and a hydrogen molecule equal the escape speed from the earth's surface? You'll find that these temperatures are very high, so you might think that the earth's gravity could easily contain both gases. But not all molecules move with. There is a distribution of speeds, and a small percentage of molecules have speeds several times . Bit by bit, a gas can slowly leak out of the atmosphere as its fastest molecules escape. A reasonable rule of thumb is that the earth's gravity can contain a gas only if the average translational kinetic energy per molecule is less than of the kinetic energy needed to escape. Use this rule to show why the earth's atmosphere contains nitrogen but not hydrogen, even though hydrogen is the most abundant element in the universe.
In the discussion following Equation it was said that . Prove that this is so.
A room contains air at . What is the room's thermal energy?
The rms speed of the atoms in a sample of helium gas is . What is the thermal energy of the gas?
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