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Description
Flashcards by James Middleton4075, updated more than 1 year ago
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Created by James Middleton4075
almost 10 years ago
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| Question | Answer |
| What is ultrasound? | The name given to sound waves that ave frequencies higher than 20,000 Hz, i.e.. above the upper threshold of the human hearing range |
| What are the key features of a wave? | Amplitude - the maximum disturbance caused by a wave wavelength - the distance between corresponding points on two successive disturbances frequency - the number of waves produced in 1 second |
| Name three applications of ultrasound and how it is used in each application | Ultrasound imaging - Ultrasound can be used in medicine to look inside people, measure the speed of blood flow or check that a baby is developing. Breaking down kidney stones - Ultrasound waves can be used to break down kidney stones so they can be removed without the need for painful surgery. Ultrasonic waves cause the kidney stones to vibrate, making them break up and disperse. They are then passed out the body in urine. Body Scans - Ultrasound waves are used to build up a picture of the organs in the body, including the heart, lungs and liver. They can also be used to detect gallstones and tumours. |
| What are the advantages of using ultrasound imaging over x-rays? | It is able to produce images of soft tissue It does not damage living cells |
| What is the difference between longitudinal waves and transverse waves? | Longitudinal Waves - Each particle moves backwards and forwards about its normal position parallel to the direction of wave movement Transverse waves - Each particle moves up and down about its normal position at right angles (90 degrees) to the direction of the wave movement. Use the book for diagrams |
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