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. *second harmonic.
*B. *first harmonic.
*C. *fourth harmonic.
*D. *third harmonic.
14. 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. *amplitude
*B. *compression
*C. *intensity
*D. *frequency