What is Mach 2 and is it faster than the speed of sound?

As mentioned in the other answer, it depends. Since the speed of sound through the standard atmosphere is 761 mph (1223 km/h) at sea level, Mach 2 then follows as 1522 mph (2447 km/h). read more

The Mach number is a speed in a medium than is the speed of sound. Mach 2 is twice that of Mach 1. Yes, Mach 2 is faster than the speed of sound. It is twice the speed of sound in the same medium. read more

The sound source has now broken through the sound speed barrier, and is traveling at 1.4 times the speed of sound, c (Mach 1.4). Because the source is moving faster than the sound waves it creates, it actually leads the advancing wavefront. The sound source will pass by a stationary observer before the observer actually hears the sound it creates. read more

Even though sound isn't as fast as light the speed sound travels at isn't exactly slow. Something that travels at 761 miles per hour is still pretty fast. Objects such as planes that go faster than the speed of sound (761 mph) travel at Mach 1. Objects that travel 2 times the speed of sound (1522 mph) travel at mach 2. read more