Final answer:
The fourth harmonic of the viola's fundamental frequency of 325 Hz is 1300 Hz.
Step-by-step explanation:
The fundamental frequency of a viola playing a note is 325 Hz. The fourth harmonic of the viola's fundamental frequency of 325 Hz is 1300 Hz. The fourth harmonic of a string instrument, such as a viola, can be calculated by multiplying the fundamental frequency by the harmonic number.
The harmonic number represents the order of the harmonic being considered, with the first harmonic being the fundamental frequency itself.
In this case, to find the fourth harmonic, we multiply the fundamental frequency by 4. So, the fourth harmonic of the viola's fundamental frequency is 4 x 325 Hz = 1300 Hz.