Infrasound and Ultrasound

Hannah Sweet P5 11/2/10

Organisms and Infrasound

It’s a sound that is below 20 Hz. This is non-audible to humans.

Some animals that use infrasound are whales, elephants, thunder, explosions, sonic booms, and other man-made objects including washing machines.

Survival Instincts

Animals use this in order to warn others. They also use infrasound when they are looking for food or even possibly a mate. The calls can also be used to maneuver herds.

Tigers use infrasound to warn off animals through their roar.

Animals have also been known to flee the area before an earthquake or a storm happens.

Ultrasound

It is a sound that is above 20,000 Hz. This is Non-audible to humans.

Some examples of objects that use Ultrasound everyday include: Drilling, Mixing, Ultrasounds in order to look underneath skin and into the body, Dolphins, Moths, Bats, and other animals use ultrasound.

Why and How Ultrasound is Used….

Animals, such as dolphins and bats, have built in ultrasounds. They use them in order to hunt for their prey. They can also use them to find other animals, such as their own predators.

Dolphins also have a special ability to sense when a women are pregnant. It’s kind of like their “sixth sense”.

They use a “sonar”, which is just like their navigational system. Just like our GPS.

They make high-pitched noises, which the human ear cannot pick up, which travel out and when it hits an object it bounces back to them to tell which way their food went.

With bats, their ultrasounds can even tell what shape and size the object is.

Other Waves….

Constructive Interference: Girls playing jump rope

Destructive : 2 kids swinging jump rope in opposite directions.

Reflection: Looking into a mirror Refraction: Swimming while body above water

looks normal, beneath the water your body looks bigger.

Defraction: Talking inside a classroom and the sound waves going around the door and into the hallway.

FIN