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.
38. Based on Figure 1, for the Xe and Ar gas samples with V = 20 L, compared to λ for Xe, approximately how much longer is λ for Ar ?
Your Answer is
Correct Answer is J
Explanation
Look at figure 1, when the abscissa V=20 L, the ordinate of Ar is about 200 nm more than the ordinate of Xe