Question

What is de broglie wavelength of an atom at absolute temperature ?

Answer 1

Let the temprature be T in Kelvin (K)
Also

Boltzmann constant (k) = 1.38 * 10^-23 J Mol ^-1 K^-1
Now

Let us calculate kinetic energy of molecule at absolute temprature

T is given by    E = 3/2 kT
Now
wavelength = h/root 2mE = h/ root 3mkT

where h = 6.6 X 10^-34 

So wavelength = 1.45 X 10^-10 m