O-LevelPhysicsWaves5054/21 · Oct/Nov 2015 · Q75 Marks
Audible sound waves and ultrasound waves both consist of compressions and rarefactions.
- (a)Describe one difference between a compression and a rarefaction.[1]
- (b)(i)In a particular medium, the speed of both audible sound and ultrasound waves is v. State the equation that relates the wavelength λ of a sound wave to its frequency f.[1]
- (b)(ii)Explain how, in this medium, the wavelength of an audible sound wave compares with the wavelength of an ultrasound wave.[1]
- (c)Describe one use of ultrasound waves.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [1] at compression: molecules closer together or pressure higher or vice versa for rarefaction
- [1] v = fλ or in words
- [1] larger and because the frequency is lower
- [1] states one use (e.g. prenatal scanning)
- [1] basic idea (e.g. ultrasound reflects off foetus)
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