Frequency is a physical quantity that relates to the number of cycles made by a wave per second. Therefore the required expression for the frequency of the lower note is: [tex]\frac{2}{3}[/tex] f
A wave is a phenomenon that propagates through a material medium without any permanent effect on the molecules of the medium. It transmits energy from one end of the medium to another. Examples are sound waves, light waves, electromagnetic waves, etc.
The propagation of a wave gives rise to frequency. Which can be defined as the number of cycles made by a wave per second. And it is measured in Hertz.
Let the frequency of the higher note be represented by f, and that of the lower note by [tex]f_{l}[/tex]. Thus, we have;
[tex]f_{l}[/tex] = [tex]\frac{2}{3}[/tex] f
Therefore, the expression for the frequency of the lower notes is [tex]\frac{2}{3}[/tex] f.
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