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CH 8-9 QUIZ
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The lowest parts of a transverse wave are
called _______.
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Troughs
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Longitudinal Waves move the particles of the medium ______ to the direction in
which the waves are traveling.
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parallel
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The maximum distance that the particles of a
medium move from the rest position is the
__________.
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Amplitude
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The distance between two crests of a
transverse wave is the ________.
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Wavelength
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The bending of waves due to a change in speed
is called _________.
example:
light through a lens
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Refraction
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The bending of waves around the edge of a barrier is known as
___________.
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Diffraction
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Waves combine to make a wave with a
smaller amplitude in a process called
_______.
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Destructive Interference
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Resonance occurs when vibrations
traveling through an object match the object’s natural ___________?
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Frequency
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Waves produced in the crust by earthquakes
are called__________.
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Seismic Waves
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_______ is a mixture of sound waves that
sound pleasing.
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List the basic groups of musical
instruments.
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WindString
Percussion
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Sound waves with frequencies below the
normal human range of hearing are called
______.
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Infrasound
INFRA …. BELOW
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Above what dB level can sound damage the ears?
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100 dB or Greater
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Doctors use _________ to make sonograms.
(Hint: Very High Frequencies)
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Ultrasound
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Some bats use _________ to navigate?
“Sound” is not specific enough.
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Echolocation
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The most common type
of hearing loss is due to __________.
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Aging …. Getting Older.
Why?: Hair Cells in the Cochlea die.
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_______ are the slower seismic waves during an earthquake.
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Secondary OR S-Waves
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Frequency is measured in units called ______.
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Hertz OR Hz
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The height of a tsunami is ____ over the open ocean, and gets _____
when it reaches the shore.
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low or small
and gets….
taller or larger
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During a storm, do you first
see lightning OR
hear thunder ?
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See lightningLight = 300,000,000 m/sec
Sound = 343 m/sec
Sound comes later.
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List the 3 variables that affect the speed
of sound.
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ElasticityTemperature
Density
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__________, or sound level, is
measured in units called Decibels.
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Loudness
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The ________ of a sound that you hear
depends on the sound wave’s frequency.
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Pitch
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The changing pitch of an approaching fire
truck siren is an example of
___________.
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Doppler Effect
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How do we change the pitch of our
own voice?
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Tighten or loosen our vocal chords.
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Which part of your ear collects sound
and directs it towards the ear drum?
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Outer Ear OR Ear Canal
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Which part of your ear converts mechanical
vibrations into signals for your brain?
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Cochlea OR Hair Cells
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What concept does the most common sound effect on this slide show demonstrate?
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The Doppler Effect
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1. Complete pages313, 319, 328, 335
2. Begin working on your study guide.