Can Atoms in Liquids Be Considered Classically?

[Radiohannah]

Hey

Just wondering why atoms in liquids can be considered classically

If you compare the deBroglie wavelength with the atomic spacing, I understand that the deBroglie wavelength should be much smaller than the spacing.

But how could you show that?

If

$$\lambda = \frac{h}{mv}$$

How would you know the velocity?

 

[Radiohannah]

Sorry, DUH, I just thought

E=kT= 0.5mv^2

Silly me

 

[quantum123]

Should it be $$kT$$ or $$\frac{3kT}{2}$$ ?