Passage VI
For gas atoms in a state of random motion, the mean free path, λ, is the average distance a gas atom will travel between collisions with other gas atoms. This distance depends upon the diameter of the gas atom, d, the volume of the gas, V, and the number of atoms of the gas, N. Table 1 lists the name, symbol, and value of d (in nanometers, nm) for each of 4 gases. Figure 1 shows, for each gas, at 293 kelvins (K), how λ (in nm) varies with V (in liters, L) in a sample with N = 6 x 1023 atoms of the gas. Figure 2 shows, for each gas, at 293 K, how λ varies with N in a sample with V = 25 L.
35. According to Figure 2, what is the order of gas samples from shortest λ to longest λ for N = 15 × 1023 atoms?
Your Answer is
Correct Answer is D
Explanation
As can be seen from figure 2, the ordinate λ from short to long is Xe, Kr, Ar, Ne