Ultra Sound Flashcards
1
Q
Why might an ultra sound be less harmful than an X-ray
A
Non ironising so do not ionise and damage body cells- cause cancer
2
Q
What is an ultrasound
A
Electronic system which produces a frequency higher than human hearing - 20-20,000 Hz
3
Q
What happens when infrasound waves meet a boundary between two different media
A
Partially reflected
4
Q
What can the time taken for reflections to reach a detector determine
A
How far away a boundary is
