Dual Nature of Radiation

The temperature of an ideal gas in 3-dimensions is 300 K. The corresponding de-Broglie wavelength of the electron approximately at 300 K, is : [m_e = mass of electron = 9 $\times$ 10^$-$31 kg, h = Planck constant = 6.6 $\times$ 6.6 $\times$ 10^$-$34 Js, k_B = Boltzmann constant = 1.38 $\times$ 10^$-$23 JK^$-$1]