DP Physics (last assessment 2024)

Question 19M.3.HL.TZ1.16a

Date	May 2019	Marks available	[Maximum mark: 2]	Reference code	19M.3.HL.TZ1.16a
Level	HL	Paper	3	Time zone	TZ1
Command term	Calculate	Question number	a	Adapted from	N/A

[Maximum mark: 2]

19M.3.HL.TZ1.16a

(a)

A parallel beam of X-rays travels through 7.8 cm of tissue to reach the bowel surface. Calculate the fraction of the original intensity of the X-rays that reach the bowel surface. The linear attenuation coefficient for tissue is 0.24 cm^–1.

[2]

Markscheme

I₀e⁻^{0.24 × 7.8} ✔

0.15I₀ ✔

Award [2] for bald correct answer.

Examiners report

Air as a contrast medium. Part (a) was well calculated by most of the prepared candidates.

Syllabus sections

Option C: Imaging

Option C: Imaging » Option C: Imaging (Additional higher level option topics) » C.4 – Medical imaging (HL only)

Option C: Imaging » Option C: Imaging (Additional higher level option topics)

Question 19M.3.HL.TZ1.16a

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