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.
37. Consider 2 Kr samples at 293 K, each with N = 6 × 1023 atoms, but one with V = 25 L and the other with V = 50 L . Based on Figure 1 , λ for the 50 L sample would most likely be how many times as great as λ for the 25 L sample ?
Your Answer is
Correct Answer is C
Explanation
From figure 1, it can be seen that the line segment corresponding to Kr is a straight line with a constant slope, so the abscissa is doubled, and the ordinate is also doubled