Part A What is the single-particle collisional frequency at sea level, with T=339 K and P = 1.0 atm? The corresponding single-particle collisional frequency is reported as 1010s in the CRC Handbook of Chemistry and Physics (62nd ed., p. F-171). Express your answer with the appropriate units. ? 211 = Value Units Submit Request Answer Part B At the tropopause (11 km), the collisional frequency decreases to 3.16 x 10's primarily due to a reduction in temperature and barometric pressure (i.e., fewer particles). The temperature at the tropopause is 220 K. What is the pressure of N, at this altitude? Express your answer with the appropriate units. ? P = Value Units Submit Request Answer Part C At the tropopause. what is the mean free path for N