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.
36. According to Figure 2, doubling the sample size from 6 × 1023 atoms to 12 × 1023 atoms effectively multiplies λ for Ne by a factor of:
Your Answer is
Correct Answer is G
Explanation
Look at figure 2, for Ne, when the abscissa is 6, it corresponds to the ordinate 1600, and when the abscissa is 12, it corresponds to the ordinate 800. So λ is 1/2 of the original