P4 - Ultrasound

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  • Created by: Naomi
  • Created on: 21-01-13 17:53
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  • Ultrasound
    • Velocity = frequency x wavelength
    • It travels as a longitudinal wave containing compressions and rarefactions
      • Compressions are regions of higher pressure
      • Rarefactions are regions of lower pressure
      • Features of a longitudinal wave are:
        • They can't travel through a vacuum
        • The higher the frequency or pitch, the smaller the wavelength
        • The louder the sound, or the more powerful the ultrasound the more energy is carried by the wave and the larger its amplitude
    • Uses of ultrasound
      • Used to break down kidney stones into smaller pieces
      • When ultrasound is used in a body scan, a pulse of ultrasound is sent through the body
        • At each boundary between different some ultrasound is reflected, and the rest is transmitted
          • The returning echoes are recorded and used to build up an image of the internal structure
      • Ultrasound is preferred to    x-rays because:
        • It is able to produce images of soft tissue
        • It doesn't damage cells

Comments

Miss KHP

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This is a good mind map, especially for students who are studying the OCR Gateway Additional Science.

Mind maps are a great way to order your learning and help you remember the key points.

Once you have completed this mind map, you can test yourself to see how much you have learnt.

Courtney21

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this Mind map really helped me revise for my science exam I couldn't have made my paper a success without this

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