A $100\,\text{m}$ race gets underway when a gun is fired, creating a bang and a puff of smoke at the same moment. At what point does the finishing judge see the smoke, and at what point does he hear the bang?
Physics 0625 · IGCSE · Sound
A $100\,\text{m}$ race gets underway when a gun is fired, creating a bang and a puff of smoke at the same moment. At what point does the finishing judge see the smoke, and at what point does he hear the bang?