If a string vibrates at the fundamental frequency of 528 hz and also produces an overtone with a frequency of 1,056 hz, this overtone is the
a. first harmonic.
b. second harmonic.
c. third harmonic.
d. fourth harmonic.

the of a sound wave is defined as the amount of energy passing through a unit area of the wave front in a unit of time.
a. intensity
b. amplitude
c. compression
d. frequency