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

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.HL.TZ0.15b
Level HL Paper 3 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
18N.3.HL.TZ0.15b

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.

(b)

Outline the measurement that needs to be made after the RF signal is turned off.

[2]

Markscheme

Relaxation time «of signal/proton spin» ✔

Location/time delay of the emitted RF signal ✔

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