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QR Challenge: OCR 21st Century Science P2 Revision: If I am the answer, what is the question?

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"