Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Problem:Put a sample in a constant and in a varying magnetic field. The constant field couples with nuclear spin, forming new energy levels. The second field, usually radio waves, can have the frequency to excite transitions between the new states. A transition tells about the sample's composition-- usually, the presence of hydrogen and carbon-13. For ten points, name this type of spectroscopy, very similar to a medical scanning technique.
Solution:
Science