Container X holds helium gas at 300K, and Container Y holds xenon gas at 600K. Both containers are at the same pressure. Which statement is most accurate regarding the average kinetic energy of a single particle in each container?
a) Particles in Y have twice the average kinetic energy of particles in X.
b) Particles in X have greater average kinetic energy because helium atoms are lighter and therefore move faster.
c) Particles in X and Y have the same average kinetic energy because their pressures are identical.
d) Particles in Y have four times the average kinetic energy of particles in X because kinetic energy is proportional to T2.