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

Answer

`0.79A^(@)`

Explanation

`U_(avg)=sqrt((8kJ)/(pim))`
`U_(avg)=sqrt((8xx1.38xx10^(-23)xx298)/(3.14xx4xx1.67xx10^(-27)))`
`U_(avg)=1.25xx10^(3)`
`lambda=(h)/(mV)implies (6.62xx10^(-34))/(4xx1.67xx10^(-27)xx1.25xx10^(3))`
`lambda=0.79Å`