00:01
So if we have an open tube like this, then this is the open end and this is the closed end and the fundamental will look like this.
00:19
Or so this much is the length is that length of the tube is l which in this particular case equals 4 lambda 1 because wave length is this much and over here this part is on.
00:44
Only like this.
00:50
So that's one fourth of a...
00:53
So we have lambda 1 equals l over 4.
01:00
And frequency.
01:14
So we have a formula, v equals lambda f, while v is the speed of sound.
01:20
So in this particular case, frequency will be v over lambda 1 equals 4, v over l, l.
01:32
Now tube with one open end and the third harmonic, okay? so that's the fundamental when you have, so this is the second harmonic and then the third harmonic will be like this.
02:10
So how much is this? this is lambda, lambda and half lambda.
02:15
So that's l equals 5 lambda over 2.
02:23
So lambda equals 2l over 5 and f3 will be 5 fee over 2l...