Our Galaxy

Our Galaxy

1. Waves

   • Transfer energy through a medium
   • Energy is conserved
   • Types
     • Longitudinal
       • Oscillate particles at 90º to the direction of energy movement
     • Transverse
       • Oscillate medium particles in the same direction as energy travels
   • Terminology
     • wave length λ
     • Amplitude (a) = crest-trough/2
     • Period (T) = time for 1 full revolution = secs
       • If the x-axis measures time rather than distance, the wavelength becomes the period 
       • 1/ƒ
     • Frequency (ƒ) = cycles per seconds = Hertz
       • 1/T

2. Light

   • Light exhibits properties of both a particle and wave ∴ have particle-wave duality

3. Resources

   • Young's double slit = light exhibits particle properties
     • https://www.youtube.com/watch?v=Pk6s2OlKzKQ 
   • Michelson-Morley = light travels at c/3x10^8

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