00:01
All right, so we're told that an octave in music is a relationship between two frequencies such that the second frequency we call f2 is twice the first frequency.
00:11
That represents f2 being an octave above f1.
00:15
And so let's say we take a note that has a frequency of 262 hertz, which is a middle c.
00:23
We want to know what is a note that is two octaves above c4 in pits.
00:30
So that note we'll call this f c6 is just going to be two octave.
00:36
It's an octave above the first octave, which is c5.
00:41
And so it's going to be four times this frequency, c4.
00:46
So 262 times four, this gives us 1 ,048 hertz.
00:53
And then next up, we're told if each string on a viola is tuned to concert a by adjusting the tension to a certain value.
01:02
What should be the tension of the string so that it plays in a note one octave below that? so basically, let's say we have a frequency of a4, and this is twice the frequency of a three for a given length of string.
01:19
And so the speed of sound on the string is going to be like the wavelength of the string, which will just keep what it is times the frequency...