Properties of Sound
Terms in this set (37)
What is sound?
A disturbance that travels through a medium as a longitudinal wave.
What are 3 types of mediums that sound can travel through?
1. Air (gas) 2. Liquids 3. Solids
A reflected sound wave
The use of reflected sound waves to determine distances or to locate objects.
Occurs when the echoes of a sound are heard after the sound source stops producing sound waves.
Why do bats and dolphins use echolocation?
To navigate and to find food
The ability of a material to bounce back after being disturbed
How much matter or mass there is in a given amount of space or volume.
It describes what you actually hear. Your perception of the energy of a sound. A sound wave of greater intensity generally sounds louder.
The amount of energy a sound wave carries per second through a unit area. Intensity is measured in watts per square meter.
A unit that compares the loudness of different sounds. Each 10 dB increase in sound level represents a tenfold increase in intensity. Example: A sound at 30 dB is ten times more intense than a sound at 20 dB. Sounds louder than 100 dB can cause damage to your hearing.
A description of how high or low the sound seems to a person. The pitch of a sound that you hear depends on the frequency of the sound wave. Sound waves of high frequency have a high pitch, while sound waves of low frequency have a low pitch.
Sound waves with frequencies ABOVE the human range of hearing
What is the function of each section of the ear?
1. Outer Ear - funnels sound waves 2. Middle Ear - transmits the waves inward 3. Inner Ear - converts sound waves into a form that travels to your brain
Sound waves with frequencies BELOW the human range of hearing
What are four causes for hearing loss?
1. Injury 2. Infection 3. Exposure to loud sounds 4. Aging
Another name for your voice box
The narrow region in your ear that is only a few centimeters long and ends at the ear drum
A small tightly stretched, drumline membrane
What happens to a sound wave when it enters your ear?
What happens is more detail ...ear canal to eardrum vibrates behind the eardrum three tiny bones, hammer...cochlea, etc.
The outer ear FUNNELS the soundwaves , the middle ear TRANSMITS the soundwaves inward, the inner ear CONVERTS them into a form that travels to your brain.
A fluid filled cavity shaped like a snail shell
A system that uses reflected sound waves to detect and locate objects underwater.
The picture created by an ultrasound imaging device by using reflected ultrasound waves.
A set of notes that combine in patterns that are pleasing to the ear.
The LOWEST natural frequency of an object.
The HIGHEST natural frequency of an object.
The study of how sounds interact with each other and the environment.
Name 2 ways that a sound wave can diffract?
Through narrow openings and around barriers
Speed of sound depends on what 3 factors?
The (1.) elasticity (2.) density and (3.) temperature of the medium the sound travels through
How does temperature affect the speed of sound?
Sound travels more SLOWER at LOWER temperatures than at higher temperatures
Why do people use ultrasound technologies?
To look inside the human body. For example, ultrasound images of a fetus inside the mother.
What are 3 groups of musical instruments? How is pitch controlled in each group?:
(1.) Stringed (guitar and violin) PITCH depends on each string's length, thickness, the material it's made from and how tightly it's stretched. (2.) Wind (trumpets and clarinets) PITCH is controlled by the length of the column (3.) Percussion (drums, bells, cymbals, and xylophones) - PITCH is controlled by its size
The frequency of a sound wave is the number of vibrations that occur per second. A frequency of 50 Hz means fifty vibrations per second.
If the frequency of sound waves exactly matches the natural frequency of an object, the sound waves can add to the object's vibrations. Resonance occurs when the frequency of the sound waves and the natural frequency of the object are the same.
The apparent change in frequency as a wave source moves in relation to the listener. If the waves are sound waves, the change in frequency is heard as a change in pitch. As a sound source moves toward the listener, the waves reach the listener with a higher frequency. The pitch appears to increase because of the Doppler effect.
It describe the quality of the sound you hear. The blending of the fundamental tone and the overtones makes up the characteristic sound quality, or timbre, of a particular sound.
Mixture of sound waves that do not sound pleasing together.
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