At high altitudes the air is less dense. If the density of air were half that at sea level, how would d, the mean free path of an electron in air, change? (A) d would be the same. (B) d would be twice...

At high altitudes the air is less dense. If the density of air were half that at sea level, how would d, the mean free path of an

electron in air, change?

(A) d would be the same.

(B) d would be twice as long.

(C) d would be half as long.

(D) d would be 1/4 as long.

(E) d would be 4 times as long.