Shown at the right are two plots of the Maxwell ve- locity distribution f(v). The solid line is a plot of the distribution for an ideal gas of *He atoms at 7" = 400K. Which of the following could be the system described by the dashed line? [H, molecules are half as massive as 'He atoms. (a) An ideal gas of *He atoms at T = 100 K (b) An ideal gas of Hy molecules at T = 800 K (c) An ideal gas of *He atoms at T' = 1600 K (d) An ideal gas of Ha molecules at T = 200 K (e) More than one of the above (explain which) ) (f) None of the above (explain why)