X-ray/contrast media Watch

Super199
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6c) Why can't you use barium?

http://www.ocr.org.uk/Images/319539-...of-physics.pdf
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Dragolien
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I believe that you mean 7c). Barium can be used in X-rays, but only for the digestive system. The question specifies the circulatory system.
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Super199
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(Original post by Dragolien)
I believe that you mean 7c). Barium can be used in X-rays, but only for the digestive system. The question specifies the circulatory system.
Cheers,

another question 4aii)

care to explain what my graph should look like?
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Dragolien
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(Original post by Super199)
Cheers,

another question 4aii)

care to explain what my graph should look like?
Using the capacitor voltage formula: and

We see that when r decreases, V(t) will become larger if time isn't 0. So the curve should decrease slower than the first one.
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Super199
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(Original post by Dragolien)
Using the capacitor voltage formula: and

We see that when r decreases, V(t) will become larger if time isn't 0. So the curve should decrease slower than the first one.
So it will be below the first graph?
also how do you know r decreases?
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Dragolien
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(Original post by Super199)
So it will be below the first graph?
also how do you know r decreases?
The first graph should be a concave. The second one is also concave, but not as much, so it should start at the same place, but it should then be above the curve.

The resistance decreases because NTC thermistors provide less resistance if they are heated.
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