At 32 degrees Fahrenheit, it travels at 1086 ft/s. However, the general consensus is that at sea level and at 68 degrees Fahrenheit sound travels at 1125 ft/s. The crack or sonic boom of the bullet passing just over your head, if you’re close enough, will cause hearing damage. 1000 yards from the shooter and behind a concrete barrier you can’t hear the muzzle blast. Those people a thousand yards away from the rifle, standing 3-4 feet under the path of the bullet, wear hearing protection as most of the bullets are still supersonic and are still cracking (small sonic boom) as they pass over their heads. After the shooter fires, the target is pulled down, the score recorded, a spotter is placed in the bullet hole, and the target is pushed back up above the berm. Traditionally, at thousand-yard F class matches, target pullers are 1000 yards from the shooter and are behind a giant dirt and concrete bunker located just underneath the paper target that is being shot. The pilot won’t hear it as he’s traveling faster than the sound. Airplanes that travel at Mach 1 or faster than the speed of sound can create sonic booms. Essentially, the pressure waves at supersonic speeds can’t get out of the way of each other fast enough and they get compressed together, hence the boom. Bullets or objects that travel faster than the speed of sound create shock waves that create a loud booming or crack. Thunder is a sonic boom on a larger than bullet-sized scale. All bullets traveling faster than the speed of sound create this sonic boom or bullet crack. Some of you know this phenomenon as a sonic boom. The second source of sound is caused by the bullet breaking the sound barrier.
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