Thunder.
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The sound following the flash of lightning is thunder. Thunder is caused by the rapid expansion and contraction of air surrounding the lightning bolt, creating a sonic shockwave that we hear as a loud rumbling noise.
Thunder is the sound produced by lightning as it rapidly heats and expands the air. It is not a flash like lightning, but rather the result of the shock wave created by the sudden expansion of the air.
The time lag between seeing the flash of lightning and hearing the thunder corresponds to the distance between you and the lightning strike. To calculate this distance, you can use the fact that sound travels at approximately 343 meters per second in air. So, for a 4-second time lag, the lightning strike is approximately 1372 meters away.
Thunder itself is not visible. Thunder is the sound produced by the rapid expansion of heated air surrounding a lightning bolt. Lightning, on the other hand, is visible and is the actual electrical discharge that produces the light we see during a storm.
Lightning ans sound is used in a mime perfomance to help the audience relate to different moods and reactions of a mime performer. For example a loud bang with a bright flash would potray a surprise moment.
The lighting of a photo flash bulb is exothermic because it releases energy in the form of light and heat when it ignites. This process involves a chemical reaction that produces a sudden burst of light.