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Starter  Write down on the mini white board the types of electromagnetic wave used for communication . (Hint) Remember the types: Gate X Usually Lets In Most Radiation. C/W 22 nd November 2011

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Starter  Write down on the mini white board the types of electromagnetic wave used for communication.

(Hint) Remember the types:

Gate

X

Usually

Lets

In

Most

Radiation


C/W 22nd November 2011

Electromagnetic waves for communicating

Keywords: carrier wave modulation

Objectives:

Must – State which types of electromagnetic waves are used for communication. (C/D)

Should – Understand how information is carried using electromagnetic waves. (C/B)

Could – Consider why we use specific electromagnetic waves for carrying information. (A/A*)



Visible light, is used in radiation. fibre optics, and Morse code........


Microwaves are used in radiation. mobile phones, satellite TV, and sat-nav.

Not absorbed by the earths atmosphere, can be transmitted into space.


Radio waves are used for: radiation.

Radio signals, terrestrial TV, and walky-talkies


Infra red is used for: radiation.

Remote controls  These waves can only travel short distances in air.


C/W radiation. 22nd November 2011

Electromagnetic waves for communicating

Keywords: carrier wave modulation

Objectives:

Must – State which types of electromagnetic waves are used for communication. (C/D)

Should – Understand how information is carried using electromagnetic waves. (C/B)

Could – Consider why we use specific electromagnetic waves for carrying information. (A/A*)


We are going to see how signals are actually broadcast as a wave..... Today’s Jazzy simulation

Recap on waves

Crest / Peak

a

Displacement+

Time

a

Trough


How are sound waves broadcast through the air? wave..... Today’s Jazzy simulation

1st we need a high frequency carrier wave....

Then we need to add the sound wave to it that we want to transmit

This gives us a modulated carrier wave


We are going to see how signals are actually broadcast as a wave.....

Pupils make their own waves using audacity

Complete questions on worksheet.


Plenary sketch on your mini white board wave.....

One type of e-mag wave used for communication and it’s application


Plenary sketch on your mini white board wave.....

The carrier wave

Sound signal to be broadcast

Modulated carrier wave


C/W wave..... 22nd November 2011

Electromagnetic waves for communicating

Keywords: carrier wave modulation

Objectives:

Must – State which types of electromagnetic waves are used for communication. (C/D)

Should – Understand how information is carried using electromagnetic waves. (C/B)

Could – Consider why we use specific electromagnetic waves for carrying information. (A/A*)


http://boswellsphysics.blogspot.com wave...../

Or google ‘Boswells physics’


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