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Science Ch. 2 Ques.

Lessons 1-5 questions and answers

What is sound? A disturbance that travels through a medium as a longitudinal wave.
How do sound waves travel? As a longitudinal wave.
Can sound waves diffract? Yes.
What factors affect the speed of sound? Temperature, stiffness, and density.
Does a sound wave travel slower or faster in a lower temperature. Slower.
Does a sound wave travel faster in a stiffer medium? Yes.
Which are stiffer, solids, liquids, or gases? Solids.
Does sound travel faster in in a denser material? No.
What affects pitch? The frequency of the sound wave.
What is frequency measured in? Hertz (Hz).
What affects loudness? The energy and intensity of the sound wave.
When the amplitude is faster what happens? The more energy it has.
What does a sound do as it moves away from its source. The intensity weakens and it spreads out.
What is loudness measured in? Decibels (dB).
What causes the Doppler effect? The motion of the source causes the waves to either get closer together or spread out.
People behind the firetruck hear a (lower/higher) pitch than the firefighters in the truck hear. Lower.
People standing in front of the firetruck here (lower/higher) pitch than the firefighters in the truck hear. Higher.
What determines sound quality? The blending of a fundamental tone with its overtones.
What is the lowest natural frequency called? The fundamental tone.
What is the highest natural frequency called? The overtone.
What happens when you shorten a string or air column? The pitch gets higher.
What are the three groups of musical instruments? Stringed, percussion, and wind.
How do your ears work? It gathers sound waves and sends information about the sound to your brain.
What does the outer ear do? It collects sound waves and directs them into the ear canal.
What does the middle ear do? It contains the hammer, anvil, and stirrup.
What does the inner ear do? It contains the cochlea, which sends messages to the brain about sounds felt by the hair cells in the cochlea.
What are the main causes of hearing loss? The eardrum being punctured or damaged, extended exposure to loud sounds, and hair cells in the cochlea dying and not growing back.
Which animals use echolocation? Dolphins and bats.
How do people use ultrasound technology? Observing things they can't see directly.
Distance = Speed of sound x Time
What device makes sonograms? An ultrasound imaging device.
Created by: KiraZ22