echolocation and sonar
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Echolocation and Sonar. How Dolphins Use Sound. Echolocation Movie. Why does this person use echolocation? What is the range this person is capable of? Do you think you could learn to echolocate?. Sound Sim. choose interference by reflection, then choose Pulse. Send one pulse at a time. - PowerPoint PPT PresentationTRANSCRIPT
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Echolocation and Sonar
How Dolphins Use Sound
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Echolocation Movie
• Why does this person use echolocation?• What is the range this person is capable of?• Do you think you could learn to echolocate?
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Sound Sim
– choose interference by reflection, then choose Pulse. Send one pulse at a time.
• What do the waves do when they hit the barrier?
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Echo Introduction
• Have you heard an echo before? • What is an echo?
• What makes an echo?
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Echo
• Sound hits an object and bounces back• You hear the bounce
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SONAR (SOund Navigation and Ranging)
• This uses the idea of sound bouncing back.– Scientists know how fast sound travels in water.
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Bat, Dolphin and Whale Communication
• Watch the video
• Is it easier to see or hear the whales?
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Types of Dolphins
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Bottlenose DolphinSmallest of Toothed Whales
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Bottlenose Dolphin
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Oceanic Dolphins
• Including orcas and pilot whales, there are 32 species of oceanic dolphins
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River Dolphins• There are 5 species of river dolphins
Baiji, or Yangzte River Dolphin
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Porpoise
Finless Porpoise
Harbor Porpoise
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Dolphin Communication• Clicks and whistles are the two main types of
dolphin vocalization. • Each dolphin has its own “signature whistle” • Dolphins recognize each others’ whistles
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Echolocation• Some dolphins use echolocation to help them
find and capture food.
• Echolocation is Nature’s Sonar.
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Animals That Use Echolocation
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Dolphin’s Echolocation• Sound waves travel 4 times faster through water- much
faster than sound travels through air!
• These sound waves bounce off objects in the water and return to the dolphin in the form of an echo.
• This is similar to the sound simulation and how the sounds hit the barrier and bounce back.
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Echolocation – Click Train
What do you notice about the sounds as theyget closer?
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Anatomy of a Dolphin’s HeadSound Reception
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How far can Dolphins echolocate?• Some dolphins can use echolocation to detect a 15
centimeter (6 inch) long fish a football field away!
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Echolocation vs. Sight• Whales and dolphins are not blind! In fact,
neither are bats.• Whales and dolphins see better than bats, but
both use echolocation as their primary tool.
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Common Dolphin Sound Clips
• What did you hear in each sound clip?• How are the two sounds different from each
other?
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Dolphin Communication/Sounds• slapping a body part against the surface of the
water– Tail or fluke slapping
• Kerplunks• jaw claps