Sound arrives late – Beirut explosion proof!

Описание: The video captures the moments before the explosion at the Port of Beirut on August 4, 2020, from a distant location inside a music studio. The sequence of events reveals a fascinating physics lesson. The first thing usually noticed in explosion videos is the flash. Light travels at 300,000 km/s and arrives almost instantly, but since it was daytime, the flash wasn't visible in this clip. Second, the Tremor: What the studio video shows next is the ground shaking and lights flickering. This happens because the explosion was so massive it generated a seismic wave, an "artificial earthquake," that traveled through the ground. Seismic waves move at several kilometers per second (between 5 and 8 km/s in the Earth's crust). Finally, the Sound: The sonic shockwave, traveling through the air, is much slower, moving at about 343 meters per second. In the video, there's a 4 to 5 second delay between the ground tremor and the arrival of the deafening explosion sound. This speed difference between waves is the same reason why, in a storm, we see lightning before hearing thunder.
Source: Speed of sound Wikipedia - Speed of light Wikipedia - Seismic wave Wikipedia
Video credits - Lynn Chamoun (TikTok)
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