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What is de-Broglie wavelength of a He-at...

What is de-Broglie wavelength of a He-atom in a container at room temperature. `("use"U_(avg)=sqrt((8kT)/(pim)))`

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The correct Answer is:
`0.79Å`
`U_(avg)=sqrt((8RT)/(piM))`
`lambda=(h)/(M.V_(Avg))=(4)/(N_(A)).sqrt((8RT)/(piM))=0.79Å`
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