First section of the em spectrum n4 physics unit. Covers different types of waves and their: properties, applications, potential hazards and sources
| Front | Visible light detector |
| Back | Photodiode, retina of eye, photographic film, photodiode, LDR |
| Front | Radio and TV wave typical sources |
| Back | Electrical aerial/ radio transmitter, stars, sparks and lightning |
| Front | Visible light possible hazards |
| Back | Intense light can damage retina- the sun |