Two non-interacting classical particles having masses m1 and m2 are moving in a onedimensional box of length L. For total energy not exceeding a given value E, the phase space "volume" is given by
1
\(\pi L^2 E\left(\frac{m_1 m_2}{m_1+m_2}\right)\)
2
\(\pi L^2 E \sqrt{m_1 m_2}\)
3
\(2 \pi L^2 E\left(\frac{m_1 m_2}{m_1+m_2}\right)\)
4
\(2 \pi L^2 E \sqrt{m_1 m_2}\)