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Ultrasound scans are used to take pictures of unborn babies - OCR Gateway - GCSE Physics - Question 9 - 2023 - Paper 4
Question 9
Ultrasound scans are used to take pictures of unborn babies. Before the ultrasound scan, gel is placed on the skin. Which sentence explains why the scan only works ... show full transcript
Worked Solution & Example Answer:Ultrasound scans are used to take pictures of unborn babies - OCR Gateway - GCSE Physics - Question 9 - 2023 - Paper 4
Step 1
Which sentence explains why the scan only works when the gel is used?
Answer
The correct answer is D: The gel transmits the ultrasound waves.
Explanation
Ultrasound scans require a medium through which sound waves can travel. When the gel is applied to the skin, it minimizes the air gap and allows for better transmission of the ultrasound waves from the transducer into the body.
- A The gel amplifies the ultrasound waves.: This is incorrect because the gel does not amplify; it facilitates transmission.
- B The gel lubricates the skin.: While this may be true, it does not explain why the scan works only with the gel.
- C The gel reflects the ultrasound waves.: This is also incorrect as gel is meant to transmit, not reflect.
Thus, option D accurately explains the necessity of using gel during an ultrasound scan.