When two musical notes are a “fourth” apart, the frequency of the lower note is 3/4 the frequency of the higher note. Using f as the frequency of the higher note, write an expression for the frequency of the lower note.

Question

1/4 f
3/4 f
3/4+f
f-1/4

Answer 1

If the frequency of the higher note is \( f \), and the frequency of the lower note is \( \frac{3}{4} \) of that frequency, we can write the frequency of the lower note as follows:

\[ \text{Frequency of the lower note} = \frac{3}{4} f \]

Thus, the correct expression for the frequency of the lower note is:

\[ \boxed{\frac{3}{4} f} \]