Across
- 5. an _________ is a reflection of a sound wave from a surface.
- 6. If the light source is small, there is a full shadow called __________.
- 8. The distance from the centre of the wave to the highest or lowest point
- 9. Finding the distance to an object in this way
- 10. If we want to ‘see’ what sound waves are like we can use a microphone attached to an ___________.
- 13. light cannot through them
- 15. Waves that are made by moving your hand in and out are
- 20. The sound reflects off all the surfaces and echoes can last for several seconds.
Down
- 1. Higher notes have a higher _______.
- 2. a magnetic material as being made up of lots of very small regions
- 3. What is formed when light travels in straight lines?
- 4. coil of wire
- 7. The distinctive sound that an instrument makes is called ________.
- 11. a way of transferring energy.
- 12. the transparent outer layer of the eye
- 14. rock that attracted small pieces of iron.
- 16. unit of sound levels.
- 17. a point where magnet are cancel out.
- 18. a coil with some magnetic material in electromagnet
- 19. One of the part in outer ear.