Radio waves, ____, infrared and visible ____ are all used to carry ____, which can be sound, ____ or other ____. The information is called the ____. It is added to an electromagnetic wave called the ____ wave so that it can be ____ ____ of various ____ are sent through the ____ of a transmitter, they are sent through the atmosphere to the ____ on a ____ Radiowaves do not have enough ____ to get past the ____ (a ____ layer outside the Earth's atmosphere). Instead the radiowave is ____ back to ____. In this way the signal can be communicated ____ distances by reflecting between the ionosphere and Earth. Without reflection radiowaves cannot travel great ____ due to the ____ of the Earth. However they work well at short distances when used for ____ communication Microwaves can pass through the ____ into ____ space and are used to carry information to and from ____. For this reason microwaves are used for ____ phones and they travel well through walls in buildings making them good for ____ communication Infra-red is used in ____ controls as well as in narrow glass tubes called fibre ____. Pulses of visible light are also used to communicate in fibre optics too. These flexible glass or plastic tubes can bend around ____ but the wave can still travel infinite distances through them by being ____ reflected all the way through.

carrier waves

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