Flashcards
OCR Gateway P1e
Cards in this deck (6)
- 1P1e - Cooking and Communicating using WavesBlack and dull materials are good at emitting infra-red radiation and good at absorbing emitting infra-red radiation.
White shiny materials are poor at emitting infra-red radiations and poor at absorbing emitting infra-red radiation. - 2Cooking with WavesInfrared radiation doesn't penetrate food very easily.
Microwaves penetrate up to 1cm into food. - 3OvensEnergy is absorbed by the surface of the food.
The kinetic energy of the surface food particles increase.
The rest of the food is heated by conduction. - 4MicrowavesWater and fat molecules in the outer layers of food vibrate more and the amount of kinetic energy increases.
Energy is transferred to the rest of the food by conduction. - 5Microwave CommunicationThe transmitter and receiver must be in line of sight.
- Aerials are normally situated on the top of high buildings - 6Satellites are used for microwave communication.- The signal from Earth is received, amplified and re-transmitted back to Earth.
- Satellites are in line of sight because there are no obstructions in space.
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- Flashcards on OCR Gateway P1e, created by Zaaaara on 20/05/2014.
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- Zaaaara
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