Mid- Term Review

• elliptical orbits- to calculate, eccentricty= distance between foci/length of major axis
  
• transverse wave- particles move perpendicular to the direction of travel
• compressional wave- particles move parallel to the direction of travel
• refraction- the bending of light as it moves from one substance to another
• diffraction- the bending of a wave around an object
• EM waves- have an electric and magnetic field
• distance- how far the route is you take to get some somewhere
• displacement- how far one travels as "the crow flies"