Across
- 2. sound cannot travel through _______
- 5. the distance between two successive crests or points on the wave
- 7. used in intruder alarm or remote control
- 9. used in sterilization
- 12. a region of high pressure where molecules are moving towards each other or closer together
- 13. sound wave with frequency above 20000Hz
- 16. used in cancer treatment
- 17. vibrations of particle parallel to the direction of the wave or energy transfer
- 18. colour that refracted the most when passing through a glass prism
- 20. vibrations of particle perpendicular to the direction of the wave or energy transfer
- 22. time taken for one complete wave to pass through a fixed point
Down
- 1. used in satellite communication
- 3. the number of complete waves passing through a fixed point in a second
- 4. unit of frequency
- 6. used in optical fibre for medical and telecommunications
- 8. a region of low pressure where molecules are moving away from each other or apart
- 10. used in medical to obtain images of bones
- 11. separation of white light into seven different colours
- 14. the maximum displacement of the particle on the wave from its rest or equilibrium position
- 15. a longitudinal wave which consists of compression and rarefaction
- 19. colour that refracted the least when passing through a glass prism
- 21. a reflected sound wave