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CH 8-9 QUIZ
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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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Wind String 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 lightning Light = 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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Elasticity Temperature 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 pages 313, 319, 328, 335 2. Begin working on your study guide.
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