O-LevelPhysicsWaves5054/22 · Oct/Nov 2019 · Q56 Marks
Both sound and ultrasound are longitudinal waves.
- (a)Describe what is meant by longitudinal.[2]
- (b)(i)[Figure 5.1] shows an ultrasound cleaner being used to clean jewellery. The jewellery is lowered into the cleaning fluid and ultrasound waves of frequency 42000 Hz are produced in the fluid. The speed of ultrasound in the fluid is 1500m/s. Calculate the wavelength of the ultrasound in the fluid.[2]
- (b)(ii)Describe how the ultrasound cleans the jewellery.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [B1] vibration / oscillation of particles or energy transfer or compressions and rarefactions
- [B1] vibration / oscillation (of particles) parallel to energy travel direction / propagation direction
- [C1] (λ=) v/ f or 1500/42 000
- [A1] 0.036 m or 3.6 cm
- [B1] (ultrasound) vibrates (the cleaning fluid / jewellery)
- [B1] dirt shaken off
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →