No clue

  • Thread starter jbot2222
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  • #1
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i dont know how to do this...nothing comes to mind. any help will be appreciated!


A pressure as low as 4×10-11Pa has been obtained. Suppose a chamber contains helium at this pressure and at temperature 380K. Estimate the collision time (tau) for helium in the chamber. Take the diameter of a helium molecule to be 1×10-10m.
 

Answers and Replies

  • #2
dextercioby
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Do u know the formula giving the mean free path ([itex] \lambda [/itex])??If so,combine it with the thermal velocity to find the mean collision time...

Daniel.
 

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