SOUNDWAVES, THE USES OF ULTRASOUND, SEISMIC WAVES [P12.5 - 7] Flashcards
[P12.5 - 7]
1
Q
sound cannot travel in space bc…
A
space = vacuum, and sound needs particles to move through
2
Q
sound moves fastest through…
A
SOLIDS; particles are closer together
3
Q
humans can hear between frequencies of:
A
20 Hz and 20 kHz
4
Q
frequency above 20kHz is called
A
ultrasound
5
Q
DETECTION AND EXPLORATION
A
[1] waves sent through a medium by a transmitter
[2] when they reach a boundary between 2 media, the sound waves will be PARTIALLY REFLECTED
[3] the waves reflected are detected by a reliever and the timing of the echo received is measured
[4] time is used to determine the distance to the track/seafloor/fetus
6
Q
USES
A
- medical imaging [babies]
- echo-sounding [seafloor]
- industrial imaging [cracks]
7
Q
types SEISMIC WAVES
A
- P WAVES
- S WAVES
8
Q
P WAVES
A
- P = PRIMARY wavs.
- LONGITUDINAL + travel faster than S waves so they arrive first
- travels through SOLIDS, LIQUIDS, GASES [travels through air as SOUND]
9
Q
S WAVES
A
- S = SECONDARY WAVES
- TRANSVERSE + slower that P waves.
- travels through SOLIDS
