| Question | Answer |
| radio waves - microwaves - infrared - visible light - ultra violet - x-rays - gamma rays | Put the following electromagnetic waves in order of lowest to highest energy: radio waves, microwaves, infrared, visible light, ultra violet, gamma rays, x-rays.
|
Blue | What colour of visible light has the highest frequency?
| Sunburn and skin cancer | What are the health risks of being exposed to too much ultraviolet light?
| Photons | Electromagnetic waves carry energy in packets. What are they called?
| False | True or false: waves with the lower frequencies have the most energy.
| Infrared and microwaves. | Some radiation waves can have a heating effect. Name two of them.
| False. Only UV, x-rays and gamma rays can ionise atoms or molecules. Other radiations don't have enough energy. | True or false: radio waves, infrared, UV, x-rays and gamma rays are all ionising radiations.
| They knock off electrons as there photons are high energy. The created particles are called ions. | Describe in a sentence, what ionising radiations do to atoms and molecules.
| Skin tanning. Seeing through substances. Treating cancers. | Name two uses of ionising radiations.
| Photosynthesis. | Name one process which removes carbon dioxide from the atmosphere.
| Respiration, combustion, decomposition, volcanic activity. | Name at least two processes which release carbon dioxide into the atmosphere.
| Combustion releases carbon dioxide. There will be fewer trees to remove carbon dioxide from the atmosphere using photosynthesis. | Write a couple of sentences explaining why tree burning increases the amount of carbon dioxide in the atmosphere.
| Increased temperatures, extremes of weather, rising sea levels. | List three effects of global warming.
| They use microwaves for communication. | What type of radiation do mobile phones use for communication?
| They can carry more information, the signals can travel longer distances, they are cheaper than copper cables, they are lighter, they are not affected by other electromagnetic signals. | List three advantages of using fibre optic cables instead of copper cables to carry information.
| A digital signal. | What type of signal only has two possible values?
| Only digital signals can be cleaned up by a regenerator. Analogue signals cannot be cleaned up/regenerated, they can only be amplified, but the noise gets amplified as well. | The following sentence is not correct. Describe why; "Analogue signals can be cleaned up by a regenerator. Digital signals cannot be cleaned up" |
