Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
34 Cards in this Set
- Front
- Back
Sound waves begin with ___. |
A vibrating object. |
|
The vibrating prong of a tuning fork ___. |
Sets the air molecules near it in motion. |
|
Region of a longitudinal wave in which the density and pressure are greater than normal. |
Compression |
|
Region of a longitudinal wave in which the density and pressure are less than normal. |
Rarefaction |
|
Sound waves are ___. |
Longitudinal |
|
In a longitudinal wave, ___. |
Vibrations of air molecules are parallel to the direction of wave motion. |
|
(True/False) Audible waves are waves that humans can hear. |
True |
|
(True/False) Infrasonic waves have a higher frequency than audible waves. |
False |
|
Audible wave frequency range for an average human is: |
20 Hz - 20,000 Hz |
|
Ultrasonic waves are sound waves with frequency ___ than 20,000 Hz. |
Greater |
|
(True/False) Infrasonic waves can be used for medical imaging. |
False |
|
Ultrasonic waves have a ___ wavelength than audible waves. |
Shorter |
|
Different ___ can hear different ranges of sound. |
Species of life-form |
|
An individual's hearing depends upon ___. |
Age and exposure to loud noises. |
|
The perceived lowness or highness of a sound |
Pitch |
|
Pitch directly depends on ___. |
Frequency |
|
Higher pitched sounds have ___ frequencies. |
Higher |
|
Difference between frequency and pitch |
Frequency is objective because we can measure it; pitch is perceived. |
|
Ultrasonic waves have ___. |
Widespread medical applications. |
|
In order to produce images, sound waves must have a wavelength that is ___. |
As small as, or smaller than, the size of the object being measured. |
|
Sound waves are partially reflected when ___. |
They reach materials of different densities. |
|
The speed of sound depends upon ___. |
Medium's substance and its temperature. |
|
Sound waves can travel through ___. |
Solids, liquids, and gases. |
|
(True/False) Sound waves can travel through the vacuum of space. |
False |
|
Sound waves travel in ___. |
Three dimensions |
|
At distances far from the source, sound waves are ___. |
Plane waves. |
|
The Doppler Effect occurs whenever ___. |
There is relative motion between the source and observer of a sound. |
|
The pitch is higher ___ (in front of/behind) a source of sound.
|
In front of |
|
As the frequency of a sound wave rises, ___ the pitch.
|
So does |
|
Waves of frequency ___ MHz are typically used in medical imaging applications.
|
10 |
|
In the human body, sound travels at this speed.
|
1500 m/s |
|
The higher the temperature of the medium, the ___ (faster/slower) the sound. |
Faster |
|
Rays are ___ to the wavefronts. |
Perpindicular |
|
A wavefront is ___. |
All the points on the same crest or trough in 3D space. |