Use Of Electromagnetic Waves In Communication
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What is the frequency range for mobile phones
800MHz to 2.6 GHz
What are some examples of electromagnetic waves?
Light x-rays gamma rays infrared Radio waves microwaves
What is the frequency for satellites
1 to 40 GHz (microwaves)
What frequency does wi-fi and Bluetooth use?
2.4 GHz microwaves
What is the range of a Wi-Fi router?
10 to 100metres
What is the range for Bluetooth devices?
About 10 metres
What is the frequency for infrared
The frequency of pulses is only around 40KHz
What is the range of infrared?
Infrared devices have a range of just a few metres and need a clear line of sight to work
What is special about the frequency of infrared
Infrared waves have high frequency but info is sent as pulses
What does handshaking mean for devices
If devices want to send information to each other they need to pair through a process called handshaking
Why is handshaking important?
This stops information getting lost and jumbled and there is a knowledge meant when messages are received There may security features such as passwords and encryption
What are the uses of spectroscopy?
Astronomy find out what stars are made from Chemical analysis - flame tests Monitoring concentrations e.g in environment studies such as oxygen levels