Physics - US Flashcards
1
Q
What is the equation for speed?
A
Speed = Freq * wavelength
2
Q
What is the speed of sound assumed by the US machine?
A
1540 m/s
3
Q
How does speed and frequency change in different media?
A
Speed and wavelength changes but frequency does not
4
Q
Reducing sound to 10% is what change in DB?
A
-10 db
5
Q
Reducing the sound intensity to 1% is what change in DB?
A
-20 db
6
Q
What scale is DB on?
A
log
7
Q
Tissue that reduces ultrasound intensity by 3 dB is what?
A
Half value thickness
8
Q
What has more scatter higher or lower frequency?
A
High
