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Oscillations and waves, sound and optics, image, image, image, image,…

- - - - Period
        
        The minimal time in which the conditions of motion are repeated
      - Frequency
        
        The number of times that the process repeats its conditions for each unit of time
  - - - Characteristics:
        
        Magnitude of motion: Distance between the position of equilibrium and the extreme position occupied by an oscilating mass.
        
        Restoring force: A force that trends to return a mass into its position of equilibrium causing variations in its speed.
      - Mass-Spring
        
        A system that has oscillatory motion with the characteristics of an SHM.
        
        Hoke´s Law
        
        Established by Robert Hooke, describes the behavior of springs and other elastic bodies, whenever the deformation is not very large.
  - - - Any body that can oscilatee from a point of suspension. Under some conditions a pendulum will oscillate as a simple harmonic motion
- - - - The propagation of energy in space, which lets it be detected at another distant point in space.
      - A source, which causes the propagation of the phenomenon.
  - - - Mechanical Wave: Needs an elastic medium to spreed.
    - - Transverse waves: Waves whose oscilation is perpendicular or transverse of the direction of propagation.
      - Longitudinal waves: They oscillate in the same direction of the propagation of the wave.
- - - - Produced by vibration, sound is a mechanical wave propagatred through an elastic medim
      - The speed of propagation of the sound is higher in solid,lower in liquids and much lower in gases.
      - Chatacteristics
        
        Timbre: Quality of the sound waves.
        
        Loudness or intesity: The amplitude of the wave, measurend in decibels and determines whether a sound is strong or weak.
        
        Pitch: The frequency of the wave, higher the frequency the acuter the sound and the lower the frequency the more bass.
      - Doppler effect
        
        Effect presented when tere´s relative motion between a source of waves and a receiver or observer.
- - - - Olaus Roemer was the first to estimate the speed of light, he calculated that the speed of light was 2.31 x 10^8 m/s