Hi, I don't have access to my schoolboard so I can't check if I'm doing this homework correctly, so I'm going to ask the forum for help with this.
So correct me if I'm doing this wrongly, and tell me if I'm doing it properly:
I've got an oscilloscope, it has an 8x8 grid of divisions, each division is 0.02
ms (0.00002 s). It has 4 vibrations on it.
I have to precisely calculate the frequency of the noise that is being portrayed on the oscilloscope.
What I did was this:
| Vibrations | 4 | 1 | 200 000 |
| Time | 0.00002 | 0.000005 | 1 |
To explain this table, I want to calculate the time of one vibration first, because it's nice to know, so to calculate that, you're going to write:
So to get 1 second from 4, you obviously do : 4, and as you know, what you do on one side of the table, you also do in the other. So now we know that 1 vibration is made every 0.000005 seconds. But we are going for the frequency, which is how many vibrations are made in 1
second. This is the next step:
We calculate how many times 0.00002 seconds can fit into 1 second. Which is 50 000 times. Again, what we do on one side we do on the other, so 4 x 50 000, which is 200 000. So the
f would be 200 000 Hz.
However, 200 000 Hz is awfully high, and it makes me think my answer is unrealistic because a flaw in my calculations, which is why I'm asking this question. This may not seem like the proper forum to ask it on, but I don't visit any other, and I think it'd be a fun experiment. So, whats up? Is my exam question just batstuff insane, or are my calculations wrong?
