Need help in orgo;?
Answer:
He's talking about electro-magnetic radiation. The type of radiation that nuclei absorb when the go from one nuclear spin state to another is in the radio frequency range. 50-500 MHz is a typical range, compared to 100 MHz on your FM dial.
The horizontal axis is related to frequency, yes. The units are PPM. So if the approximate frequency of the spin flip is 400 MHz (typical for hydrogen -- but it depends on how big of a magnet the instrument has -- a technical detail you don't need to worry about right now), then one PPM is 400 Hz. So if the scale reads from 0-10, the whole axis is 4000 Hz wide. The reason it's backwards is just a matter of convention.
Do you mean Electromagnetic radiation? Electromagnetic radiation in the form of RF (radio frequency) waves are used to flip nuclei in the sample from one spin state to another spin state. The measurement of the energy of the wave is how the nuclei in a particular sample are charterized.
You need to restate your question a little more clearly before a correct answer can be provided.
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