What is the de-Broglie wavelength of an atom of mass m, moving at absolute temperature T K?

What is the de-Broglie wavelength of a ball of mass 0.060 kg moving at a speed of 1.0 m/s.

What is the de-Broglie wavelength of a bullet of mass 0.040 kg travelling at the speed of 1.0km/s.

What is Kraft temperature (T_k) ?

What is the de-Broglie wavelengths of a nitrogen molecule in air at 300 K? Assume that the molecule is moving with the root-mean-square speed of molecules at this temperature. (Atomic mass of nitrogen = 14.0076 u).

What is the de-Broglie wavelength of an electron with kinetic energy of 120 eV?