Average speed of an air molecule is 485 ms–1 and number density of air molecules is 2.7 × 1025 m–3. If molecule of air has spherical shape of diameter 2 × 10–10 m. Then average distance between two successive collisions of air molecules is nearly

 Average speed of an air molecule is 485 ms–1 and number density of air molecules is 2.7 × 1025 m–3. If molecule of air has spherical shape of diameter 2 × 10–10 m. Then average distance between two successive collisions of air molecules is nearly

	3 × 10–6 m
	2.1 × 10–7 m
	3 × 10–7 m
	5 × 10–9 m