All Problems

Kinetic theory of gases. Boltzmanns Law and Maxwell distribution

Problem 2.88

The temperature of a hydrogen and helium mixture is TT =300 K=300 \mathrm{~K}. At what value of the molecular velocity vv will the Maxwell distribution function F(v)F(v) yield the same magnitude for both gases?

Reveal Answer
v=3kTln(m2/m1)m9m1=1.61 km/sv=\sqrt{\frac{3 k T \ln \left(m_{2} / m_{1}\right)}{m_{9}-m_{1}}}=1.61 \mathrm{~km} / \mathrm{s}