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Waves:red_flag: ((Period (:!:The time it takes to make a complete circle…

- - - - :forbidden:Hearing: The sound-waves which enter our ears, strike the eardrum; causing it to vibrate and then this information caused by vibration is passed to the brain, which translates the signals into complex sounds that we can understand clearly.:forbidden:
      - :tada:Swings in the parks: The back and forth, repetitive movements of the swing against the restoring force :tada:
- - - - :star:Is when the crests or the troughs of the waves interfere with the other. Therefore their amplitudes are added to find the total amplitude:star:
      - :check:https://www.google.com/url?sa=i&url=http%3A%2F%2Fphysics.bu.edu%2F~duffy%2Fpy105%2FWaveInterference.html&psig=AOvVaw01UUXSI_rpUtZ--F66zMP1&ust=1587065272686000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCPiuvJ6V6-gCFQAAAAAdAAAAABAD :check:
      - :no_entry:When you have two speakers facing each other. Then, play the same music at the same time. The music will appear louder and more powerful:no_entry:
  - - - :forbidden:Noise canceling headphones work by using a microphone to pick up the frequencies of incoming waves. The headphone then sends out a wave that is the exact opposite, canceling out the sound:forbidden:
      - :star:Is when a crest and a trough interfere with each other. This results in a lower amplitude than those of the original waves:star:
      - :green_cross:://www.google.com/url?=i&url=http%3A%2F%2Fphysics.bu.edu%2F~duffy%2Fpy105%2FWaveInterference.html&psig=AOvVaw3XAM5GhpcZB5kF1X1t04tW&ust=1587066192136000&source=images&cd=vfe&ved=0CAIQjRxqFwoTCIiXs82Y6-gCFQAAAAAdAAAAABAD :green_cross:
- - - - Radio Waves
        
        :star:To transmit sound and television signals:star:
        
        :no_entry:Radio waves are a type of (EM) radiation with wavelengths in the electromagnetic spectrum longer than infrared light:no_entry:
        
        :check:https://images.app.goo.gl/i5LgNuFbV281wNUX9:check:
      - Microwaves
        
        :red_flag:A cell phone encodes the sounds of the caller's voice in microwaves by changing the frequency of the waves:red_flag:
        
        :star:Are a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter:star:
        
        :recycle:https://images.app.goo.gl/EUALfZUpJQuCtjvv7:recycle:
      - Infrared Waves
        
        :warning:Heat from an electric heater:warning:
        
        :red_cross:Infrared waves are electromagnetic radiation of a particular wavelength or color that we have named 'infrared.':red_cross:
        
        :check:https://images.app.goo.gl/rsgspTnjoLTmRb596:check:
      - Visible Light
        
        :no_entry:A very narrow range of wavelengths in the electromagnetic spectrum that falls between infrared light and ultraviolet light:no_entry:
        
        :recycle:https://images.app.goo.gl/oQWraeRdwrpBd7Ay7:recycle:
        
        :star:Our eyes see the reflection of sunlight on the objects around us:star:
      - Ultraviolet Waves
        
        :red_flag:Hospitals use UV lamps to sterilize surgical equipment and the air in operating theaters:red_flag:
        
        :green_cross:https://images.app.goo.gl/SX8XLd2VZtB5Lbkh7:green_cross:
        
        :warning:Ultraviolet is electromagnetic radiation:warning:
      - X-rays
        
        :explode:X-rays can also be used to kill cancer cells, but also kill healthy cells, so must be used with much care:explode:
        
        :forbidden:Are high-energy electromagnetic waves:forbidden:
        
        :star:https://images.app.goo.gl/FwrNJJG3h7LrBk4s6:star:
      - Gamma rays
        
        :check:A stream of high-energy electromagnetic radiation given off by an atomic nucleus undergoing radioactive decay:check:
        
        :warning:https://images.app.goo.gl/9gjzf98kpqYno4DX9:warning:
        
        :no_entry:When a fast spinning massive star goes supernova and forms a neutron star or black hole:no_entry:
  - - - :red_flag: Reflection is the change in direction of a wave-front at an interface between two different media so that the wave-front returns into the medium from which it originated:red_flag:
      - :fire:Bend when entering a new medium:fire:
      - :explode:Cause to undergo diffraction:explode:
- - - - Parts of a Wave
        
        Velocity
        
        :check:The wave velocity is the velocity of the linearly transferred energy. Since the energy travels one wavelength, in one period, the velocity can be expressed as distance over time. :check:
        
        Crest
        
        :no_entry:The displacement of the medium above this undisturbed position :no_entry:
        
        Wavelength
        
        :forbidden:Distance between corresponding points of two consecutive waves. :forbidden:
        
        Trough
        
        :green_cross: The displacement below the undisturbed position:green_cross:
      - Mechanical
        
        :recycle: Is a wave that is an oscillation of matter, and therefore transfers energy through a medium :recycle:
        
        Electromagnetic Waves
        
        :star:One of the waves that are propagated by simultaneous periodic variations of electric and magnetic field intensity and that include radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays. :star:
      - https://images.app.goo.gl/JfQdW2w94UZjRTPw7
      - :warning: 1.Vibrations in a guitar string.:warning: 2. Ripples on the surface of water.
    - - https://images.app.goo.gl/FPY25SGHERJWMJqg8
      - Rarefaction
        
        :check:Is the reduction of an item's density, the opposite of compression. Also exist in nature. :check:
      - :warning:1. Speaking on the mic.:warning: 2. Vibration in Window Panels after a Thunder.
      - Compression
        
        :explode:Is a region in a longitudinal wave where the particles are closest together. :explode: