how fast do u have to go to cause a sonic boom?

Question: how fast do u have to go to cause a sonic boom?
- Keywords:
  sonic boom,
  speed
Asked by 12ccollins to Nik on 15 Mar 2013.
- Nik Watson answered on 15 Mar 2013:
  
  you have to go as fast as the speed of sound which is different for different materials at different temperatures and densities.
  For the air around us it is about 343 m/s which is about 700 miles per hour!

Question: how fast do u have to go to cause a sonic boom?