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Question 19M.3.HL.TZ2.17biii

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.HL.TZ2.17biii
Level HL Paper 3 Time zone TZ2
Command term Estimate Question number biii Adapted from N/A
biii.
[Maximum mark: 2]
19M.3.HL.TZ2.17biii

The graph shows a received signal incident upon a transducer to produce an A-scan. The density of the soft tissue being examined is approximately 1090 kg m-3.

(biii)

In the ultrasound scan the frequency is chosen so that the distance between the transducer and the organ is at least 200 ultrasound wavelengths. Estimate, based on your response to (b)(ii), the minimum ultrasound frequency that is used.

[2]

Markscheme

λ = 4.5 × 10 − 2 200 = 2.25 × 10 − 4 «m» ✔

f = v λ = 1500 2.25 × 10 − 4 = 6.7 × 10 6 «Hz»  ✔

 

Examiners report

Few candidates managed to understand how to approach the problem and to obtain the correct answer. ECF from bii was frequently need.

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