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Electromagnetic Waves - Coggle Diagram
Electromagnetic Waves
Properties of Waves:
Amplitude: The maximum displacement of the wave from the equilibrium position. Higher amplitude implies a wave has more energy. A sound wave with high amplitude is loud.
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Frequency: The number of complete oscillations or waves that pass through a certain point in one second. SI unit is Hz
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Electromagnetic Spectrum
The electromagnetic spectrum refers to the classification of electromagnetic waves by their frequency, wavelength and energy. The electromagnetic spectrum is as follows.
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Types of Waves
Longitudinal
Longitudinal waves particles motion is parallel to the propagation of the wave. Compression & rarefaction. Longitudinal waves ALWAYS need a medium to travel through as a medium is required to compress. Sound is an example of a longitudinal wave. Waves travel faster in denser mediums as a higher density leads to more elasticity in the medium and hence the ease by which compression and rarefaction can take place.
Transverse Waves
Transverse waves particles motion is perpendicular to the propagation of the wave. Transverse waves need a medium to travel through. They have a crest and trough. EM waves are examples of transverse wave. Light is an example of a transverse wave. Light does not need a medium because it is a electromagnetic wave.
Echos
An echo refers to the reflection of sound of a surface and it's subsequent return to the listener. There will be a time delay between the time the sound is produced and the echo due to the larger distance the wave has to cover. The intensity or loudness of the sound decreases as some of the sound is absorbed or dissipated at the reflective surface.
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Definition: A wave is a disturbance in a medium that carries energy without a net movement of particles
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