Chapter 9 - Sound, and Ultrasound Flashcards
1
Q
What is the audible frequency range of the human ear?
A
20Hz-20,000Hz
2
Q
What are sound waves?
A
Vibrations that travel through a medium
3
Q
How are echos caused?
A
By sound waves reflected from a smooth, hard surface
4
Q
Can sound waves travel through a vacuum?
A
No
5
Q
How can the pitch of a note be increased?
A
By increasing the frequency
6
Q
How can the loudness of a note be increased?
A
By increasing the amplitude of the sound wave
7
Q
How can musical instruments be heard?
A
By created vibration
8
Q
What is the frequency of ultrasound waves?
A
20,000Hz +
9
Q
Name a use for ultrasound waves in medicine
A
Destroying kidney stones
10
Q
How are ultrasound waves reflected at a boundary between 2 different types of body tissue?
A
Reflected partly
11
Q
Are ultrasound waves ionising?
A
No
