00:01
So in this question, we have a wire that is of 10 meter and 100 gram, and then it has a speed, it has a tension of 250 newton.
00:12
So again, we've deal with these type of questions.
00:15
Many times when we see these conditions, when we see these given numbers, we know we can find the speed of this wire with v equals tau over l, or tau over mu, where mu is mass density.
00:30
Which is equal to you of tau the tension over mass times l, the total length.
00:39
So, okay, what are we looking for in this question is we're looking for standing waves.
00:45
So we see what is the lowest frequency, the second lowest frequency, the third lowest frequency.
00:51
Okay, so how do we find frequency? frequency is v over lambda.
00:59
So if we have frequency equals v over lambda.
01:08
So the larger the lambda is, the larger the wavelengths is, the smaller the frequency is.
01:13
So for the lowest frequency, we need the maximum wavelengths, and the maximum wavelength happens when we have a standing wave like this.
01:22
In this case, the wavelength lambda equals, we call it lambda 1 equals l.
01:32
Over it equals 2 times l...