Sound Waves and hearing
What type of wave are sound waves
longitudinal
How can sound and matter interact?
Reflect or Absorb sound waves
Can humans produce ultrasound noises to perform echolocation with.
No
What is the snail shaped part of the ear called
cochlea
What are examples of constructive and destructive interference
constructive: sonic booms
destructive: noise-canceling headphones
In what type of medium do sound waves travel the fastest? slowest?
Fast: solid
Slow: gas
What range of frequencies can humans hear
20-20,000 Hz
What can happen if a bridge vibrates at its natural frequency.
It can collapse
What devices can store sound
phonograph, records, cd's, computers
What is the pain threshold for sound?
120 Db
If sound is traveling at a speed of 1000 m/s for 5 seconds and then 500 m/s for 5 seconds. How far total did it travel
7500 meters
How do telephones transmit sound?
Sound waves--> electrical signals --> radio waves --> electrical signals--> sound waves
Explain the doppler effect
A moving train will have a higher frequency coming towards you, and a lower frequency when going away from you.
How can we find how far sound will travel, if we know its speed and the amount of time it is traveling for?
How can we find how long a sound travels for if we know how far it traveled and its speed?
How can we find how fast sound is traveling, if we know how far it traveled and how long it traveled
speed x time = distance
distance/speed=time
distance/time=speed
How do humans use echoes and provide an example
ultrasound: create images, doctors look at organs
sonar: locate and communicate, can find sunken ships.