Final answer:
When observing fireworks, you may see the explosion before hearing it due to the difference in speed between light waves and sound waves.
Step-by-step explanation:
When you observe two fireworks exploding, you may hear the explosion of one at the same time as you see it, while with the other firework, you may see it before hearing the explosion. This is because sound waves travel slower than light waves. Light waves travel at a speed of approximately 186,000 miles per second, whereas sound waves travel at a speed of around 1,125 feet per second. Therefore, the light from the firework reaches your eyes faster than the sound from the explosion reaches your ears, resulting in a slight delay in hearing the explosion.