CH 8-9 QUIZ

The lowest parts of a transverse wave are

called _______.

Troughs

Longitudinal Waves move the particles of the medium ______ to the direction in

which the waves are traveling.

parallel

The maximum distance that the particles of a

medium move from the rest position is the

__________.

Amplitude

The distance between two crests of a

transverse wave is the ________.

Wavelength

The bending of waves due to a change in speed

is called _________.

example:

light through a lens

Refraction

The bending of waves around the edge of a barrier is known as

___________.

Diffraction

Waves combine to make a wave with a

smaller amplitude in a process called

_______.

Destructive Interference

Resonance occurs when vibrations

traveling through an object match the object’s natural ___________?

Frequency

Waves produced in the crust by earthquakes

are called__________.

Seismic Waves

_______ is a mixture of sound waves that

sound pleasing.

List the basic groups of musical

instruments.

WindString

Percussion

Sound waves with frequencies below the

normal human range of hearing are called

______.

Infrasound

INFRA …. BELOW

Above what dB level can sound damage the ears?

100 dB or Greater

Doctors use _________ to make sonograms.

(Hint: Very High Frequencies)

Ultrasound

Some bats use _________ to navigate?

“Sound” is not specific enough.

Echolocation

The most common type

of hearing loss is due to __________.

Aging …. Getting Older.

Why?: Hair Cells in the Cochlea die.

_______ are the slower seismic waves during an earthquake.

Secondary OR S-Waves

Frequency is measured in units called ______.

Hertz OR Hz

The height of a tsunami is ____ over the open ocean, and gets _____

when it reaches the shore.

low or small

and gets….

taller or larger

During a storm, do you first

see lightning OR

hear thunder ?

See lightningLight = 300,000,000 m/sec

Sound = 343 m/sec

Sound comes later.

List the 3 variables that affect the speed

of sound.

ElasticityTemperature

Density

__________, or sound level, is

measured in units called Decibels.

Loudness

The ________ of a sound that you hear

depends on the sound wave’s frequency.

Pitch

The changing pitch of an approaching fire

truck siren is an example of

___________.

Doppler Effect

How do we change the pitch of our

own voice?

Tighten or loosen our vocal chords.

Which part of your ear collects sound

and directs it towards the ear drum?

Outer Ear OR Ear Canal

Which part of your ear converts mechanical

vibrations into signals for your brain?

Cochlea OR Hair Cells

What concept does the most common sound effect on this slide show demonstrate?

The Doppler Effect

1. Complete pages313, 319, 328, 335

2. Begin working on your study guide.