DP Physics (last assessment 2024)
Question 19M.3.HL.TZ2.17ai
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.HL.TZ2.17ai |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | State | Question number | ai | Adapted from | N/A |
ai.
[Maximum mark: 2]
19M.3.HL.TZ2.17ai
An ultrasound A-scan is performed on a patient.
(ai)
State one advantage and one disadvantage of using ultrasound imaging in medicine compared to using x-ray imaging.
Advantage:
Disadvantage:
[2]
Markscheme
Advantage of ultrasound compared to X-rays:
no exposure to radiation
OR
relatively harmless
OR
can be performed in a doctor’s office
OR
can be used to measure blood flow rate
OR
Video image possible <<eg heart, foetus>> ✔
Accept any reasonable advantage.
Disadvantage:
limited resolution
OR
difficulty imaging lungs or gastrointestinal system
OR
difficulty imaging any body part with a gas in it ✔
Accept any reasonable disadvantage.
Do not allow answers that contradict each other.
Examiners report
The question was well answered by almost all candidates.
