Waves - Disturbances or perturbation that propagate in the space or in the spacetime carrying energy, Electromagnetic waves definition - Perturbations are due to the electric and magnetic field, Mechanical waves source - Collisions and cohesion forces between particles in a medium, Gravitational waves source - Masses moving in accelerated motion, Longitudinal waves definition - Direction of perturbation is parallel to the propagation direction, Transverse waves definition - Direction of perturbation is perpendicular to the propagation direction, source of electromagnetic waves - Oscillation of an electric charge (proton, electron, ion), Common phenomena for all waves - Interference and diffraction, Phenomena involving only sound waves - ECO and Doppler effect, Speed waves definition - Length wave divided period, Frequency definition - Speed wave divided length wave, Characteristics common to all waves - Amplitude, frequency, length wave, speed wave, period,

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