00:01
So in order to answer this question, we have to look at the waves given in figure 13 .36.
00:12
And they look something like this.
00:15
Wave number 1 is all above the equilibrium position.
00:24
So this is the equilibrium position of the wave.
00:29
And wave 1 is either at that equilibrium position for the first second, and then it goes up by 1 unit for the second time interval.
00:37
I don't know if they're 1 seconds or not.
00:38
But anyway, for the first time interval, it's at the equilibrium position.
00:42
And then it goes up 1 unit for the next time interval.
00:46
Then it comes back down for two more time intervals, 2.
00:55
And then after this time interval, it goes up 2 full units and stays there for 1, 2 time intervals.
01:06
So this is a time interval here.
01:10
And then it stays there for another time interval.
01:13
And then it comes back down.
01:15
And then it stays down.
01:18
And wave 2 is either at the equilibrium position or below the equilibrium position.
01:27
So it kind of looks like this.
01:30
This is my equilibrium position for this first time interval.
01:35
It's at equilibrium.
01:36
And then it goes down 1 unit for the next time interval.
01:41
And then it goes back up to 0 for 2 time intervals, 1, 2.
01:52
And then it goes down for 1 time interval here, 1 unit.
01:55
And it goes back up to 0.
01:59
And then it stays at 0.
02:02
So all we have to do is just do our principle of superposition at each point in the wave to get our resultant wave, which is going to look like this.
02:12
So the first time interval, both the waves are 0...