Waves

Waves: 

Waves APPLICATIONS OF WAVES

What is a WAVE?: 

What is a WAVE? Waves carry energy from one place to another. Because waves carry energy, they can be used for communication (example: Radio and television waves) o transmit signals. Waves are vibrations (sometimes you may see these called oscillations ). What is oscillation ? Oscillation – is moving back and forth of sound; to vibrate.

Types of WAVE: 

Types of WAVE Sound Waves – need a solid, liquid or gas to travel in. Water waves – need water to travel in. Electromagnetic spectrum - do not need any matter to travel in. These waves are vibration of an electric and a magnetic field.

Radio Waves and Television waves: 

Radio Waves and Television waves APPLICATIONS OF WAVES IN COMMUNICATION

Radio communication: 

Radio communication The first type of radio communication was carried out using Morse Code . By turning a transmitter on and off it was possible to send long and short wave pulses that corresponded to the dots and dashes of Morse Code.

Samuel Finley Morse (1791-1872): 

Samuel Finley Morse (1791-1872) An American inventor and artist. In 1823, he patented a machine for cutting marble, and in the years 1835-1838 he constructed the first electromagnetic telegraph.

The Morse Code: 

The Morse Code

Modulation: 

Modulation Amplitude modulation (AM) -is a method of encoding acoustic oscillations in the amplitude changes of the carrier wave. Frequency modulation (FM) - is a method of encoding acoustic oscillations in the frequency changes of the carrier wave.

Methods of modulation: 

Methods of modulation

TV Signals: 

TV Signals Signals are transferred from earth stations to TV sets by means of ultra short radio waves ; and from the satellite to the receiver satellite dishes – using microwaves .

TV Signal Transmission: 

TV Signal Transmission

Delayed Transmission: 

Delayed Transmission Electromagnetic is the only carrier of information between objects in space. Despite the high speed it takes them a long time to cover cosmic distances.

Delayed Transmission: 

Delayed Transmission

Sound Waves: 

Sound Waves APPLICATIONS OF WAVES IN COMMUNICATION

Nature of Sound: 

Nature of Sound Sound is a longitudinal, mechanical wave. Sound can travel through any medium, but it cannot travel through a vacuum . There is no sound in outer space. Sound is a variation in pressure . A region of increased pressure on a sound wave is called a compression (or condensation). A region of decreased pressure on a sound wave is called a rarefaction (or dilation).

Ears catches Waves: 

Ears catches Waves