Topic 1
An echo is most likely to happen when a sound hits a surface that is _____.
Smooth and hard
What happens to the pitch of the sound that the driver of a car hears?
Stays the same
The _____ of a wave is the number of wavelengths to pass a certain point in a given time.
Frequency
When the compressions of one wave overlap the compressions of another wave and the sound becomes louder, this is an example of: _______.
Constructive interference
The more dense a medium is, the ____ sound will travel through it.
The more dense a medium is, the ____ sound will travel through it.
The amplitude of a sound’s waves determine the sound’s _______.
Loudness
The symbol for the unit used to express the loudness of a sound is _____.
Decibels (dB)
The complete back and forth motion of an object is known as ____.
Vibration
A person in Front of the ambulance would hear the pitch of the siren ____.
Higher
The part of the sound wave where the particles are crowded together is called a
Compression
Apparent change in the frequency of a sound caused by the motion of either the listener or the source of the sound is known as ____.
Doppler effect
The bouncing back of a wave after it strikes a barrier is called ____.
reflection
The use of reflected sound waves to find objects is known as ___.
Echolocation
The hammer, anvil, and stirrup are all part of the ____.
Middle ear
As the temperature of a medium increases, the speed of the sound waves through that medium _____.
increase
This section of the ear acts like a funnel for sound waves and directs them into the head.
Outer
The type of wave in which the particles of the medium vibrate back and forth along the path of the wave is a ____ wave.
Longitudinal
The part of the sound wave where the particles are spread apart is called ____.
Rarefaction
The _____ of a wave is the largest distance that the particles vibrate from rest position.
Amplitude
In this section of the ear, vibrations created by sound are changed into electrical signals for the brain to interpret.
Inner
Sounds that have a frequency too high for humans to hear are called _____.
Ultrasonic