reflection , refraction and sound

• when waves reach a boundary they can be

  • reflected
  • refracted
  • absorbed
  • transmitted
• when waves are reflected the angle of incident is equal to the angle of reflection
• ray diagram to show reflection

  
• refraction depends on the material and the angle at which the wave hits the boundary
• refractive index is the way a material affects refraction
• (refraction) when light travels

  • from a material with low refractive index to one with a higher refractive index , it bends towards the normal
  • the ray slows down
• refraction is due to the difference in the wave speed due to a different medium
• the amplitude of a sound relates to the loudness
• the frequency and wavelength of a sound relates to the pitch
• the normal range of human hearing his 20Hz to 20KHz
• sounds can travel through any medium
• sound waves are longitudinal