1. A bolt of lightning lights up the sky and 1.5 s later you hear the thunder. How far did the lightning strike from your position?
2. A supersonic aircraft passes 200 m overhead on a day when the temperature is 26-C. Estimate how long it will be before you hear its sound after it passes directly overhead and how far the aircraft is from you if its Mach number is
(a) 1.68
(b) 2.02
(c) 3.49
3. A small-amplitude wave travels through the atmosphere creating a pressure rise of 5 Pa. Estimate the temperature rise across the wave and the induced velocity behind the wave.