DP Physics (last assessment 2024)

Question 18M.3.HL.TZ1.14d.i

Date	May 2018	Marks available	[Maximum mark: 1]	Reference code	18M.3.HL.TZ1.14d.i
Level	HL	Paper	3	Time zone	TZ1
Command term	Calculate	Question number	d.i	Adapted from	N/A

d.i.

[Maximum mark: 1]

18M.3.HL.TZ1.14d.i

The table shows the speed of ultrasound and the acoustic impedance for different media.

M18/4/PHYSI/HP3/ENG/TZ1/14.d

The fraction F of the intensity of an ultrasound wave reflected at the boundary between two media having acoustic impedances Z₁ and Z₂ is given by F = $\frac{{{{({{\text{Z}}_1} - {{\text{Z}}_2})}^2}}}{{{{({{\text{Z}}_1} + {{\text{Z}}_2})}^2}}}$ .

(d.i)

Calculate the density of skin.

[1]

Markscheme

ρ = $\frac{{1.99 \times {{10}^6}}}{{1.73 \times {{10}^3}}}$ = 1.15 × 10³ «kgm^–3»

[1 mark]

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 18M.3.HL.TZ1.14d.i

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