 So we're ready to move to part C of this question, determine the frequency of the oscillation. And the reason I have these here is that solving for the angular frequency, the period or the frequency, is the most common things that you find associated with pendulums. So frequency. What is that symbol and how is it related to these other quantities? I'm actually going to have two choices here. The first one I'm going to use is that the frequency is 1 over the period and I use little f for the frequency and capital T for the period. So if I plug this in, I use my time, my period of oscillation I got on the previous problem. I've got 1 over 1.74 seconds and that's going to give me 0.57 hertz. Now hertz is the unit we often use for frequency. It's sometimes said that it's 1 per second. It's also sometimes said is it cycles per second if I have one cycle in 1.74 seconds. Now the other equation I could have used for this relates my frequency to the angular frequency and so I would have my angular frequency over 2 pi. So I could have come back here and had my 3.61 divided by 2 pi. Just as a quick caution, when you do that make sure you put the 2 pi in parentheses or your calculator may not give you the answer you expect.