O-LevelPhysicsWaves5054/21 · Oct/Nov 2017 · Q55 Marks
Some medical processes involve the use of ultrasound.
- (a)Explain what is meant by ultrasound.[2]
- (b)Explain briefly how ultrasound is used in pre-natal scanning.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2017). The mark or mark type is shown in brackets.
- [B1] pressure / vibrational / longitudinal (wave) or (wave that consists of) compressions and rarefactions or sound wave or inaudible sound
- [B1] frequency greater than 15 kHz-25 kHz
- [B1] (ultrasound) transmitted into body
- [B1] echo / reflection from (baby / fetus)
- [B1] image produced
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