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Question 18N.3.HL.TZ0.15a

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Date November 2018 Marks available [Maximum mark: 1] Reference code 18N.3.HL.TZ0.15a
Level HL Paper 3 Time zone TZ0
Command term Describe Question number a Adapted from N/A
a.
[Maximum mark: 1]
18N.3.HL.TZ0.15a

In nuclear magnetic resonance imaging (NMR) a patient is exposed to a strong external magnetic field so that the spin of the protons in the body align parallel or antiparallel to the magnetic field. A pulse of a radio frequency (RF) electromagnetic wave is then directed at the patient.

(a)

Describe the effect of the RF signal on the protons in the body.

[1]

Markscheme

protons spin direction changes

OR

proton energy state changes ✔

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