Wave of bats project

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Wave of bats project

  1. 1. Seung-ju Hong
  2. 2.  Introduction of bats Wave and Ultrasound Ultrasound used by bats
  3. 3.  Bats are the only mammal that can fly. The structure of bat’s body is different from bird structure of body. Bats are divided into two groups; micro bats and mega bats. Bats are nocturnal animal; they are active at night. Most bats cannot see at night. Therefore, they use echolocation producing ultrasound, which allows bats to be active at night. Bats hunt small insects such as flies and they avoid obstacles by using ultrasound. Bats are distributed all around the world except for north pole and south pole.
  4. 4.  Wave is a disturbance that travels through material and accompanied by a transfer of energy. The movement of ultrasound travels through a medium such as air. Ultrasound is a cyclic sound pressure wave with a frequency, which is greater than human hearing. Bats can make 50~90 KHz (a unit of frequency) and hear the sound reflected that they made. Frequency of bat’s ultrasound is directive; It is not absorbed even into the water. This enables bats to be active at night and catch insects in darkness.
  5. 5.  It is used for fish finder, echo-sounder and for the medical. An oscillator using piezoelectric effect of crystal flake produces ultrasound.
  6. 6.  Bats use echolocation, biological frequency, in order to make ultrasound. When bats emit ultrasound from their mouth, they can hear high frequency that they make while flying; they listen to the vibration that return from various objects near them.
  7. 7.  Bats use ultrasound for navigation. They catch flying insects in darkness while flying in full speed. Their sophisticated echolocation permits them to distinguish between a moth and a falling leaf.
  8. 8.  http://www.scienceall.com/dictionary/dictionary.sca?to do=scienceTermsView&classid=&articleid=254940&bbs id=619&popissue http://en.wikipedia.org/wiki/Ultrasound http://www.wisegeek.com/what-are-bats.htm http://whatis.techtarget.com/definition/sound-wave http://wiki.answers.com/Q/How_do_bats_use_ultrasoun d_to_navigate http://hyperphysics.phy- astr.gsu.edu/hbase/sound/usound.html http://12-11.wikispaces.com/how+bats+fly http://terms.naver.com/entry.nhn?docId=426871&mob ile&categoryId=1659 http://www.bats.org.uk/pages/types_of_bats.html

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