00:03
Okay.
00:05
So your first wave starts at three, ends at four, hits bottom at two, and then crosses, or at negative three, and then crosses through here and here.
00:24
Okay.
00:26
So the first wave you're given looks something like this.
00:31
Imagine i can draw like a straight, a straight curve.
00:35
Okay.
00:36
And it continues to do that.
00:37
And so it's going to follow this pattern and it's going to do that.
00:40
And it's going to do that again.
00:41
And i again.
00:45
And so we're here and we're here.
00:48
Goes down, comes up, goes down.
00:54
Okay.
00:55
Now, in the first question, you're asked for the amplitude.
01:00
All right.
01:00
So your amplitude is from the center line to the top.
01:07
Okay.
01:07
And it's just how far was it displaced? and so see here, it started at zero meters and one up to three.
01:14
So that's going to be your amplitude.
01:15
So for part one, our amplitude is going to be three and we're in meters.
01:28
Number two asks you for your wavelength.
01:33
Wave length can be found a couple different ways.
01:38
And here i'm going to go with pink for wave because i'm going to underline that and make i meant to change the color.
01:43
And our wavelength can go from crest to crest.
01:46
A crest is the top of the wave to the bottom.
01:47
Bottom and it's the horizontal distance that the wave takes up.
01:52
And so here we started at zero meters and we ended up four.
01:56
And so that's going to be our wavelength.
01:57
You could go trough to trough, or you could go from like where it starts and completes one full wave.
02:05
So you could do that no matter how you measured, it should be the same every time.
02:09
And so i'm going to go from crest to crest and that is four meters.
02:14
So my amplitude is three, my wavelength is four.
02:19
Part three, part three will do in green.
02:27
Okay, part three asks you for the speed.
02:33
Okay, speed, i'm going to use distance over time.
02:40
I'm not going to use wavelength times frequency right now.
02:44
I know that's one of the equations you probably have jotted down because i don't know my frequency quite yet.
02:52
Eventually we're going to find it.
02:54
But i do know that i was, well, you were given two waves.
02:59
One of them started here, and then the second one started here.
03:06
And so this next color i put in, this was like, if we took a picture one second later, this is how far our wave traveled.
03:18
Okay.
03:18
And so one second later, we'll just draw all of them in.
03:23
I know we're getting a lot going on here.
03:33
Okay, so in one second, my wave traveled from here to here.
03:40
So notice, i'm just kind of following the crest right now.
03:43
And my crest went from this location to this location.
03:50
And so on my graph that it traveled one meter.
03:54
And it said this red wave right here is how far it traveled in one second.
04:01
Okay.
04:02
And so it traveled in one meter, one meter in one second.
04:10
And so the speed of my wave is going to be one meter per second.
04:19
Okay.
04:20
Now, part four, part four asks us for the frequency.
04:32
Well, my frequency is my wave speed divided by my wavelength, and that's just stumbling from a formula we have for the speed of the wave.
04:47
I mean, sometimes we can think distance over time if we know a distance in a time, or if we know a wavelength, the speed of a wave is wavelength times frequency...