00:01
So we have a standing wave pattern that is produced on a string with a linear mass density of, we'll write this as 0 .00 -03 kilograms per meter, which is 0 .3 grams per meter.
00:15
And it's attached to a wave generator that is driving it with a frequency of 60 hertz.
00:22
And on the other end of the string, there's like a pulley with a mass.
00:26
Sorry, let me draw this somewhere else.
00:28
There's a pulley with a mass.
00:29
So our linear mass density will just write as 3 times 10 to the negative 4 kilograms per meter.
00:36
It's attached to a mass that is hanging.
00:40
So presumably the pulley is attached to like a table or something like this where our wave generator is sitting.
00:46
And the length of the string between the pulley and the generators, like three quarters of a meter.
00:54
And we're told that the mode of vibration is the third harmonic.
00:59
So basically our wavelength is going to be 2l divided by 3 because that's the third harmonic wavelength...