Final answer:
Speeds of Mach 0.8 to Mach 1.2 are classified as transonic speeds. When a source approaches the speed of sound, it experiences a phenomenon known as a sonic boom. A sonic boom is the sound produced when an object moves through the air faster than the speed of sound.
Step-by-step explanation:
Speeds of Mach 0.8 to Mach 1.2 are classified as transonic speeds. Transonic speeds refer to aircraft speeds that are close to but not exceeding the speed of sound. At Mach 1.0, an aircraft is traveling at the speed of sound.
When a source approaches the speed of sound, it experiences a phenomenon known as a sonic boom. A sonic boom is the sound produced when an object moves through the air faster than the speed of sound. It is characterized by a sudden increase in pressure, which creates a shock wave.
For example, if a jet is flying at Mach 2.00, it is traveling at twice the speed of sound. At this speed, a sonic boom would be heard by a stationary observer on the ground. The time it takes for the observer to hear the sonic boom depends on the altitude of the jet and the speed of sound.