A sonic boom is produced by an airplane flying at a speed A) ...

[RRMR]

A sonic boom is produced by an airplane flying at a speed
 
  A) just below the speed of sound.
  B) equal to the speed of sound.
  C) greater than the speed of sound.
  D) all of the above
  E) none of the above

Question 2

The source of a sonic boom
 
  A) must be a sound emitter.
  B) may or may not be a sound emitter.
  C) is not a sound emitter.
  D) none of the above

[ergserg]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: B