wave summary

wave summary

1. reflection and refraction

   • reflection is where light waves that bounce of an object, so like the light the bounces off the wall or somethin
   • Refraction is the bending of light beams when it travels from one medium to another, so like when you look at something underwater and it looks bigger or looks like its slighty of to the side

2. ultrasound and infrasound

   • ultra sound are sound waves we cant hear because ther above the human hearing rang so anything above 20,000 hz
     • we used it to scan the babys that are inside a person still and we can do this because when a ultrasound waves passes from one medium into another some of the waves are reflective back The time it takes for the reflections to reach a detector can be used to measure distance
   • infrasound is a sound wave below human hearing, so anything below 20 hz
     • whales use infrasound to communicat over long distances because it can travel long distances in water

3. ears and hearing

   • The human hearing range is 20hz to 20khz Dolphins and bats, which can hear frequencies over 100 kHz. Elephants, which can hear sounds at 16 Hz–12 kHz. Whales, which can hear infrasonic sounds as low as 7 Hz.
   • What happens when we hear • Sound waves reach the eardrum and cause it to vibrate. • Vibrations pass to tiny bones in your ear called ossicles, through the semi-circular canals, and to the cochlea. • The cochlea turns these vibrations into electrical signals, which are sent to the brain via the auditory nerve. • The brain interprets these signals as sound of different pitched and volumes.

4. waves crossing boundaries

   • When waves are passing from one material to another, they will reach a boundary. At this boundary, the wave might actually be reflected and unable to pass into the second material. Waves can also be transmitted or absorbed. Instead of being reflected, the waves could also be absorbed or transmitted.