There is a kind of ideal gas in a container with unchangeable volume. When the temperature is at T0 the average speed of the gas molecule is【图片】, the average munber of collisions of molecules is【图片】 and the mean free path is【图片】. If the temperature inceases to 4T0, what is the average speed【图片】, the average number of collisions【图片】 and the mean free path【图片】, respectively