Chapter 13: Vocab

Question 1

Moves through matter. (Cannot travel through a vacuum)

Answer 1

Sound wave

Question 2

Vibrations that can pass through electric and magnetic fields.

Answer 2

Light

Question 3

High point of a wave.

Answer 3

Crest

Question 4

Low point of a wave.

Answer 4

Trough

Question 5

The distance from the midpoint to the top of the crest. (Or bottom of the trough)

Answer 5

Amplitude

Question 6

From one crest to the next.

Answer 6

Wavelength

Question 7

Number of vibrations passing a given point per unit of time.

Answer 7

Frequency

Question 8

Unit of frequency, one vibration per second.

Answer 8

Hertz

Question 9

The time required for one complete vibration.

Answer 9

Period

Question 10

The speed which waves travel.

Answer 10

Wave speed

Question 11

A wave in which the particles move perpendicular to wave motion. (Water waves)

Answer 11

Transverse wave

Question 12

Particles move back and forth in the direction of wave motion. (Aka compressional waves)

Answer 12

Longitudinal Wave

Question 13

Squeezing together

Answer 13

Compression

Question 14

A thinning out. (Slinky/sound waves)

Answer 14

Rarefaction

Question 15

How high or low a sound is. (Dependent upon the frequency of the vibrating object.)

Answer 15

Pitch

Question 16

Detects human sounds 20-20,000 hz.

Answer 16

Human ear

Question 17

Frequency less than 20 hz.

Answer 17

Infrasonic waves

Question 18

Frequency greater than 20,000 hz.

Answer 18

Ultrasonic waves

Question 19

Reflection of sound.

Answer 19

Echo

Question 20

Bending of sound

Answer 20

Refraction

Question 21

The vibration of a sample of matter due to interaction with a frequency that is the same as the sample’s natural frequency.

Answer 21

Resonance

Question 22

A frequency at which an electric object tends to vibrate.

Answer 22

Natural Frequency

Question 23

The combining of two or more waves of the same wavelength.

Answer 23

Interference

Question 24

The crest of one wave overlaps the crest of another higher amplitude.

Answer 24

Constructive Interference

Question 25

The periodic variation loudness due to interference of two waves of slightly different frequency.

Answer 25

Beats

Question 26

One wave crest overlaps the trough of another lower amplitude.

Answer 26

Destructive Interference

Question 27

A stationary wave pattern formed when 2 sets of identical waves pass through a medium in opposite direction.

Answer 27

Standing wave

Question 28

The part of a standing wave that doesn’t seem to move.

Answer 28

Node

Question 29

The part of a standing wave that moves the most.

Answer 29

Antinode

Question 30

The change in frequency of wave motion resulting from motion of either the wave source or the observer.

Answer 30

Dobbler Effect

Question 31

Galaxies move away from the earth. Light shifts toward the rend end of the spectrum.

Answer 31

Red Shift

Question 32

Galaxies move toward the earth. Light shifts toward the blue end of the spectrum.

Answer 32

Blue Shift

Question 33

A vibration that moves through space and time.

Answer 33

Wave

Question 34

Object that travels faster than the speed of sound.

Answer 34

Supersonic

Question 35

V-shaped wave created when the object outruns the wave.

Answer 35

Bow wave

Question 36

The cone shapes wave made by an object moving at supersonic speed through a fluid.

Answer 36

Shock wave

Question 37

The loud sound resulting from the incidence of a shock wave.

Answer 37

Sonic boom