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Waves and Sound. By: Savannah Dotterman. Infrasound. Infrasound is a sound that is lower than 20hz. This is the “normal” limit for human hearing. The study of this type of sound is called infrasonic.

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Waves and sound

Waves and Sound

By: Savannah Dotterman


  • Infrasound is a sound that is lower than 20hz.

  • This is the “normal” limit for human hearing.

  • The study of this type of sound is called infrasonic.

  • Infrasound sometimes results naturally from severe weather, surf, lee waves, avalanches, earthquakes, volcanoes, bolides, waterfalls, calving of icebergs, aurorae, lightning and upper-atmospheric lightning.


  • Ultrasound is approximately 20 kilohertz.

  • This is greater than the upper limit for human hearing.

  • The most well known use for ultrasound is sonography to see the fetus in a pregnant woman.


Organisms that use infrasound

Organisms that use ultrasound

  • People use it to monitor earthquakes, charting rock, and petroleum formations below the earth

  • Animals perceive these waves and use them as an early warning for a natural disaster

  • People use it to see the fetus in a pregnant woman to make sure its healthy and developing ok

  • Bats use it for hunting prey

  • Used to find flaws in materials and to measure the thickness of objects

Constructive interference
Constructive Interference

  • Constructive interference is when two waves combine to make a larger amplitude. To cause a constructive interference and not a destructive interference both of the waves have to have the same sign. They both either have to be negative or they both have to be positive.

Destructive interference
Destructive Interference

  • Destructive interference is the opposite of constructive interference. When two waves combine to make a lower amplitude. It becomes lower because a negative tries to combine with a positive or a positive with a negative. Instead of the waves adding together they subtract from each other.


Constructive interference

Destructive interference

  • The suns rays reflect off of items creating bright rays of different shades

  • When two of the same sound waves combine creating a louder sound

  • When two different radio signals combine causing static

  • The suns rays reflect off of items causing dark bands with no color


  • The reflection of a wave is when a wave is going towards an object and bounces off.

  • Examples of this would be a stone in a pond that a wave can not pass so instead it hits it and bounces back.


  • The defraction of a wave is when a wave has to travel around of through something.

  • An example of defraction would be a somebody trying to talk to another person through a wall.


  • Refraction is when waves change speeds because they change mediums.

  • An example of that would be a wave slowing down because it goes from air to liquid, or a wave speeding up because it goes from solid to liquid.