wave

wave

1. electromagnetic wave

   • radio wave
   • microwave
   • infrared radiation
   • visible light
   • ultraviolet radiation
   • X-ray
   • gamma ray

2. superposition

   • make the wave bigger or cancel out

3. reflection

   • the angle of incidence=angle of feflection
   • things will be in the opposite direction in mirrors
   • sound wave will return to the object

4. refraction

   • bending of light wave
   • light waves slow down in medias like water
   • change in direction of propagation of sound wave

5. colours

   • red-violet, lowest frequency to highest
   • filters
     • filter with certain will only let that colour or the colours that make it up pass through

6. speed of light

   • 3x10^8m/s

7. sound wave

   • timbre
     • 音质
     • pitch
       • 音高
     • speed of sound
       • 330m/s

8. deffraction

   • bending of sound wave around small abstacles and the spreading out beyond small opening