Ch 7.1

Question 1

A periodic back and forth motion, or oscillation, that transmits energy

Answer 1

wave

Question 2

the substance through which a wave transfers its energy

Answer 2

medium

Question 3

there is no ___ of the particles in the medium from one place to another

Answer 3

net movement

Question 4

the high points of a wave train

Answer 4

crests

Question 5

the low points of a wave train

Answer 5

troughs

Question 6

the two major types of waves are ____ and ____

Answer 6

transverse waves and longitudinal waves

Question 7

waves in which particles of the transmitting medium oscillate at right angles to the direction of wave travel

Answer 7

transverse waves

Question 8

waves in which particles of the transmitting medium oscillate in the direction of wave motion

Answer 8

longitudinal waves

Question 9

S waves and surface waves are two types of ____ waves

Answer 9

seismic waves

Question 10

transverse waves moving through the earth or along its surface (earthquakes)

Answer 10

seismic waves

Question 11

a high pressure area in which the air molecules are bunched together; corresponds to the crest of a transverse wave

Answer 11

compression pulse

Question 12

a low pressure area in which the air molecules are farther apart; corresponds to the trough of a transverse wave

Answer 12

rarefraction pule

Question 13

a compression pulse and a rarefraction pulse together constitute a single ____ wave

Answer 13

longitudinal wave

Question 14

an oscillation caused by a restorative force that is proportional to the displacement from equilibrium

Answer 14

simple harmonic motion

Question 15

the length of a single wave

Answer 15

wave length

Question 16

the maximum distance that particles are displaced by a wave

Answer 16

amplitude

Question 17

the number of waves that pass a given point per unit

Answer 17

frequency

Question 18

the SI unit of frequency is the ___

Answer 18

hertz (Hz)

Question 19

the time needed for one cycle to pass

Answer 19

period

Question 20

the behavior of waves can be demonstrated by a ___

Answer 20

ripple tank

Question 21

the rate at which a wave travels through a medium is the

Answer 21

waves speed

Question 22

the speed of a wave will not change as long as the ___ does not change

Answer 22

medium

Question 23

speed is directly proportional to both ___ and ___

Answer 23

wavelength and frequency

Question 24

the change in the course of a wave as a result of a collision with an object or boundary

Answer 24

reflection

Question 25

the waves that strike an obstacle are called ____ waves; the waves that bounce off the object are called ____ waves

Answer 25

Incident waves; reflected waves

Question 26

The Law of ____ states that the angle of incidence equals the angle of reflection

Answer 26

reflection

Question 27

the bending of the path of a wave as a result of a change in wave speed

Answer 27

refraction

Question 28

refraction waves always bend toward the ___ that ___

Answer 28

medium that slows them down

Question 29

the spreading out of a wave after it passes through a narrow opening

Answer 29

diffraction

Question 30

diffraction causes the wave to spread out ___

Answer 30

evenly

Question 31

the reinforcement or cancellation that occurs when two or more waves meet

Answer 31

interference

Question 32

occurs when two crests or two troughs meet; the crest or trough reinforces each other, making a higher crest or deeper trough

Answer 32

constructive interference

Question 33

occurs when a crest meets a trough; they will partially cancel, making either a lower crest or a shallower trough

Answer 33

destructive interference