- Absorbed by water and fat molecules on the outside of the food, it increases kinetic energy of particles.
- The energy is transferred to the rest by conduction and convection.
- Used to transmit information over large differences in line of sight.
- Poor signals happen when areas are out of sight.
- Mobile phones and mirowave oven don't use the same wavelengths, there are concerns that mobile phones can cause harm. There are also public concerns about transmission masts.
- Microwaves signals can be lost and affected by: Large objects, (microwaves don't diffract), poor weather conditions, large areas of water, the curvature of the Earth and interferance of signals.
- You can reduced problems by: Limiting transmitter distances, and building masts higher up on high buildings and things.
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- Absorbed by all of the particles on the surface of the food, increasing the kinetic energy of particles.
- Energy transferred by conduction and convection to the rest of the food.
- Examples of usage: Remote controls, sensors, short-distance wireless data links, burglar alarms and security lights.
- TV's use digital codes. The amount of energy in the wave depends on frequency and the dangers.
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- Used to transmit data, they vary in amplitude.
- Can have any value within a fixed range.
- Poor signal quality due to interference.
- Can be used to transmit data as a series of pulses.
- The value do not vary. Only 2 states, on (1) and of (0).
- They suffer from interference but it doesn't affect the signal.
- High signal quality because interference is removed.
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Wireless communication: Advantages:
- No connection to a phone land-line needed.
- Portable, can be used anywhere.
- Aerials are needed to pick signals up.
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