Understanding the Delayed Effects of the Russian Meteor Strike

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The delay between the meteor explosion in Russia and the sonic boom reaching nearby cities is due to the distance the sound waves must travel. The meteor exploded in the atmosphere, not directly over populated areas, causing a time lag. Sound travels slower than light, which is why the visual explosion is seen before the sound is heard. The exact duration of the delay depends on the distance from the explosion site to the observer. Understanding this phenomenon involves basic principles of physics, particularly the differences in the speed of light and sound.
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Why was there a delay between the explosion from the meteor in Russia and the sonic boom hitting the cities? And how long was it?
 
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Hint: I am moving this question to introductory physics.

You really should read read the forum rules. You have to show your attempts at solving the question to receive help. This is a forum policy.
 
The answer is simple. It's because the meteor didn't explode _in_ the Russian cities.
 

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