How come you see lighting and do not hear it and how come you hear thunder and do not see it?
You see lightning before you hear it because light moves faster than sound. Thunder comes from the lightning. You can't hear it until the sound waves reach you.
Generally, yes. Lighting and thunder originate at the same time, but since light travels much faster than sound, you see the lightning before you hear the thunder. The one exception is if the lighting strikes very close, within a few hundred feet. In this case you see the lightning and hear the thunder at essentially the same time.
If the time lag between seeing the flash of lighting and hearing the thunder is 4 seconds how far away is the lighting?
Why is the sound of a thunder heard after the lighting is seen although they are produced at the same time?
Thunder is what you hear, lightning is what you see, but both are due to electrical discharge in the atmosphere. They can seem to be separated in time to an observer (you see the lightening before you hear the thunder) because of the large difference in the speed of sound and the speed of light. If you are significant distance away (a few miles or kilometers), the light from the discharge will reach you almost…
The speed of light is faster than the speed of sound. So when lightning occurs, you can see it sooner than you then hear it. The further away you are from the lightning, the longer it takes for you to hear it. If lightning occurs right near you, you see the flash and hear the thunder at the same time.
Lighting always comes just before thunder because it is the heat of lightning that causes thunder. Lightning is seen when there is a discharge of atmospheric electricity in the clouds or between clouds and the ground. The energy from the lightning heats the air and causes a sudden expansion of the air (followed by a rapid contraction), which results in the sound called thunder. Since the heat of lightning causes the expansion that results in…