"Core Physics topic 4 and 5": HTML5 Crossword

Across

2. Too much exposure to high energy radiation can lead to (6)
4. A part of the EM spectrum used to cook food from the inside and used in communication (9)
7. Radio waves are produced by (11)
9. A light ray crossing a boundary where it speeds up will bend.. (17)
11. X-rays and gamma rays are higher frequency than ultra-violet radiation and so transfer more… (6)
13. The unit of frequency? (5)
14. The maximum distance of a wave away from its rest position? (9)
16. When a wave changes direction because its speed has changed whilst crossing a boundary? (10)
18. A part of the EM spectrum used to diagnose broken bones (5)
19. The number of waves produced each second? (9)

Down

1. A part of the EM spectrum which can be detected by our skin (8)
3. A part of the EM spectrum used to detected forged bank notes (11)
5. A piece of equipment used to generate and project an image of water waves (10)
6. A light ray crossing a boundary where it slows down will bend.. (16)
8. The distance between two consecutive peaks on a wave? (10)
10. Radio waves cause an oscillating current in a (15)
12. A part of the EM spectrum used for treating and detecting cancer (9)
15. A part of the EM spectrum used for transmitting radio broadcasts (10)
17. Ultra-violet can cause what if too much is absorbed by the skin? (7,0)