00:01
So a 65 centimeter guitar stream, 6 .5, 65 centimeter, it's fixed at both ends, and in the frequency range between 1 and 2 kilohertz, we find the resonant to be 1 .2, 1 .4, and 1 .8.
00:28
And we want to know what's the speed of traveling with.
00:32
So just by looking at this, because we have, we see that all of these frequencies differ by 300 hertz.
00:48
So if this is fn, this is fn plus one, this is fn plus two, we can see that because the resident frequencies differ by 300 hertz to each other, we can tell that the fundamental frequency f1 equals 300 hertz.
01:13
So knowing that, we can find velocity v, v.
01:18
V equals lambda times f.
01:23
And of course, the reason we want to find the fundamental frequency is because we want to find the wavelength that is associated with the frequency.
01:33
So we can, we can, it doesn't really, we don't really have to use the f1, we can use f2.
01:40
In that case, we will have this wavelengths.
01:44
In f3, we can have this wavelength, but usually we go to the fundamental frequency because we find it a lot easier to use this.
01:52
The wavelength equals 2l...