3.3 ECHOES Flashcards
1
Q
Echoes are caused by…
A
sound reflecting off a surface.
2
Q
____________ reflect sound better, the echo will be more clear
A
smooth surfaces
3
Q
In rough surfaces, the sound _________, so we hear less of it
A
diffuses
4
Q
Echoes can last for several seconds, muddying the sound. This is called…
A
reverberation
5
Q
We can reduce echoes by adding _____ materials to a room
A
soft
6
Q
___________ is used in medical systems to help see development of babies
A
Ultrasound
7
Q
Ultrasound uses the _____________ to form images of the babies.
A
reflection of sound
8
Q
Some animals uses echoes to __________ and ___________
A
detect directions ; hunt for food
9
Q
Sonar is short for __________________
A
sound navigation and ranging
10
Q
Formula for counting sonar
A
Distance = speed x time / 2
