Book-Girl
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For the P3 exam do we have to know the exact way in which a CT scanner works or do we just need to be able to evaluate the advantages and disadvantages? Also, do we need to know the exact wavelength, wave speed and frequency of x-rays?

Thanks in advance! I'm really nervous for this exam!
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spnlove
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(Original post by Book-Girl)
For the P3 exam do we have to know the exact way in which a CT scanner works or do we just need to be able to evaluate the advantages and disadvantages? Also, do we need to know the exact wavelength, wave speed and frequency of x-rays?

Thanks in advance! I'm really nervous for this exam!
You definately have to know how a CT scanner works but I don't think you have to know the exact wavelength e.t.c of x-rays, just that they're high frequency and short wavelength (about the same size as the diameter of an atom).
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Book-Girl
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(Original post by spnlove)
You definately have to know how a CT scanner works but I don't think you have to know the exact wavelength e.t.c of x-rays, just that they're high frequency and short wavelength (about the same size as the diameter of an atom).
Thank you! Could you also explain what a virtual image is and why a mirror produces a virtual image?
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spnlove
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(Original post by Book-Girl)
Thank you! Could you also explain what a virtual image is and why a mirror produces a virtual image?
Yeah so a virtual image is one which can't be formed on a screen or another definition is when the real light rays don't cross. In the exam I would probably use that second definition cause in the past they've not allowed the first one. A mirror produces a virtual image because the object appears to be behind the mirror as the image is formed when imaginary lines have crossed.
I hope that makes sense
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