If we use a common alkyl halide, such as methyl bromide, and a common solvent, ethanol, we can examine the rate at which various nucleophiles substitute the methyl carbon. Nucleophilicity is thereby related to the relative rate of substitution reactions at the halogen-bearing carbon atom of the reference alkyl halide.
U.S. Navy. For an airplane to break the sound barrier, it must hit speeds of about 770 mph â when it does that a couple of things happen. All the air in front of the craft gets pushed together, can't get out of its own way â and when that magic number gets hit â the air finally breaks free and crashes behind the plane causing a sonic boom.
Contrary to what some think, thunder is not caused by the lightning bolt âbreaking the sound barrierâ. If this were true, then every time we turned on a light in the house we would hear a sonic boom! The speed of light is about 186,282 miles per second. The speed of sound is about 0.211 miles per second at sea level.