The frequency of the musical note C4 is about 261.63 Hz. What is the frequency of the note a perfect fifth below C4?

A - 130.82 Hz

B - 174.42 Hz

C - 256.63 Hz

D - 392.44

The frequency of the note a perfect fifth below C4 is;

B - 174.42 Hz

Step-by-step explanation:

Here we note that to get the "perfect fifth" of a musical note we have to play a not that is either 1.5 above or 1.5 below the note to which we reference. Therefore to get the frequency of the note a perfect fifth below C4 which is about 261.63 Hz, we have

1.5 * Frequency of note Y = Frequency of C4

1.5 * Y = 261.63

Therefore, Y = 261.63/1.5 = 174.42 Hz.