Question

question 7 of 10
sound molecules can \stack up\ in front of airplanes traveling at very high speeds. this can cause which of the following?
a. subsonic speeds
b. fire
c. sonic booms
d. a combustion reaction

Explanation:

When an airplane travels at very high speeds, sound molecules stack up in front of it. This creates a shock - wave known as a sonic boom. Subsonic speeds are slower than the speed of sound and don't cause this stacking. Fire and combustion reactions are not directly caused by sound - molecule stacking.

Answer:

C. Sonic booms