A molecular beam apparatus employs supersonic jets that allow gas molecules to expand from a gas reservoir
Question:
AH = Cp TR = 1 / 2 Mv2
The temperature of the reservoir is generally greater than the final temperature of the gas, allowing one to consider the entire enthalpy of the gas to be converted into translational motion.
a. For a monatomic gas CP = 5/2R. Using this information demonstrate that the final flow velocity of the molecular beam is related to the initial temperature of the reservoir (TR) by:
b. Using this expression, what is the flow velocity of the a molecular beam of Ar where TR = 298 K? Notice that this is remarkably similar to the average speed of the gas. Therefore, the molecular beam resulting can be described as a gas that travels with velocity v, but with a very low internal energy. In other words, the distribution of molecular speeds around the flow velocity is significantly reduced in this process.
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