The range of frequencies that humans can hear is ______.
20-20,000 hertz.
100
The speed of sound is fastest in
a. gases
b. solids
c. liquids
b. solids
100
The change in sound frequency caused by motion of the sound source and or motion of the listener is called the ______.
Doppler Effect
100
Sound is collected by the _________.
Outer ear.
200
Sound intensity levels are measured in units called _____.
Decibels.
200
The threshold of pain is ________ decibels.
120
200
The speed of sound is _________ in colder weather.
a. faster
b. the same
c. slower
c. slower
200
Two uses of ultrasound are _______.
Sonar and ultrasound imaging.
200
Name the three bones of the ear.
Hammer, Anvil, and Stirrup.
300
The intensity of sound is depends on the ______ of the wave & the ______ from the source.
Amplitude and Distance.
300
________ is the rate at which a wave's energy flows through a given area.
Intensity.
300
Salt affects the speed of sound in water by making the speed:
a. faster
b. slower
c. more intense
a. faster
300
Ultrasound is sound at frequencies that are ________ than most people are capable of hearing.
a. higher
b. lower
a. higher
300
The snail shell shaped organ of the ear is called the _____.
Cochlea
400
_______ is the frequency of a sound as you perceive it.
Pitch
400
The higher the frequency, the higher the ________.
Pitch
400
On a nice spring day with low humidity, sound would travel approximately _________ m/s.
342 m/s
400
Infrasound is sound at frequencies ________ than most people can hear.
a. higher
b. lower
b. lower
400
Sound vibrations are amplified in what part of the ear?
Middle Ear
500
The part of a sound wave where the particles are close together are called _______________.
Compressions.
500
Sound travels faster in solids because the molecules are:
a. smaller.
b. closer together.
c. heavier
a. closer together
500
On a nice spring day with low humidity, it takes 1.4 seconds for an echo to bounce back to you from the opposite side of the Grand Canyon, what 2 values would you use to figure out the distance across?
.7 seconds times 342 m/s.
500
The blind boy in the video was able to get around by the use of __________.
Echolocation
500
The part of the ear damaged by loud sounds is
a. the ear drum
b. the bones
c. hairs in the cochlea