Why do you not hear the sound of distant fireworks until after you see them?
Solution 1E Step 1: 8 The speed of light and sound are different. Speed of light, c = 3 × 10 m/s Speed of sound in air, v = 340 m/s The source of sound and light as a part of the firework is originating at the same time. Since it is travelling at different speeds, there will be a specific time lag between the light and the sound.