This phenomenon is known as a shock wave. Shock waves are also produced if the aircraft moves faster than the speed of sound. If a moving source of sound moves faster than sound, the source will always be ahead of the waves that it produces.
Plus, few majors can guarantee a financial return that will offset the financial debt many students will accumulate during college. Two-year degrees, of which an associate degree is the most common, provide training and education for a variety of fields in approximately half the time as a bachelor's degree. Plus, you can earn an associate degree from a local community college for a fraction of the cost of a four-year degree at a university. Also, for most areas of study, an associate degree puts you halfway toward a four-year degree should you decide to pursue one at a later time.
Usually 22 years old. Most people finish high school in the US at 18. Most BSME and also BSEE, BSChemE etc., are four year programs. So if they go straight through four years of college with no delays or detours then they will graduate with a four years bachelor degree at 22 Y.O..