Answer:
What happens when a plane passes the speed of sound?
Answer - You hear a loud BOOM then you cant hear it
How does it sound?
Answer - there is no sound
Is the sound super high since the wavelength is super low or maybe even non-existent?
Answer - When its about to break the sound barrier it makes a high pitched sound
How does it look and why does it look that way?
Answer - Its air you cant see it ;-;
How will it affect people on ground?
you will hear the sound and it might hurt but nothing else
Explanation: