| A | B |
|---|
| Infra red has a ……………. wavelength than ultraviolet | longer |
| Infra red has a ……………. frequency than ultraviolet | lower |
| Visible light, infrared and ultraviolet are all types of… | electromagnetic waves |
| Electromagnetic waves can travel without any …………. to vibrate | particles |
| Electromagnetic waves with shorter wavelengths have ……… frequencies | higher |
| Gamma rays have the highest…… | frequency |
| The full range of the electromagnetic waves is called the… | electromagnetic spectrum |
| Space is a…. | vacuum |
| A vacuum is… | a place where there is no matter (particles at all) |
| Excessive exposure to X-rays or Gamma rays may cause…. | mutations |
| A mutation is where…. | DNA is changed |
| Mutations can… | kill cells or cause cancer |
| Harmful effects of microwaves… | internal heating of body cells |
| Harmful effects of infrared | skin burns |
| Harmful effects of ultraviolet… | damage of surface cells and eyes |
| Excessive exposure to ultraviolet can lead to.. | Skin cancer and eye conditions |
| Radiowaves can be used for… (name 3) | broadcasting, communications, satellite transmissions - 1mark each |
| Microwaves can be used for.. (name 3) | Cooking, communications, satellite transmissions - 1 mark each |
| Infrared can be used for… (name 3) | cooking, thermal imaging, short range communications, optical fibres, TV remote controls, security systems |
| Visible light can be used for…. | Vision |
| Ultraviolet can be used for… | security markings, fluorescent lamps, detecting forged bank notes, disinfecting water |
| X-rays can be used for….. | observing internal structure of objects, airport security, medical X-rays |
| Gamma rays can be used for… | sterilling food or medical equipment, detection and treatment of cancer |
| Gamma rays are used to kill cancer in… | radiotherapy |
| Optical fibres carry signals for the… | internet or telephone calls |
| Ionising radiations are emitted all the time by… | radioactive sources |
| Ionising radiation include… (name 3) | alpha, beta, gamma |
| Ionising radiation remove electrons from atoms to form… | ions |
