Waves and sound

Question 1

Wave

Answer 1

a disturbance that transmits energy through matter or space

Question 2

Sound

Answer 2

transmitted by mechanical longitudinal waves

Question 3

medium

Answer 3

a substance through which a wave can travel

Question 4

pitch

Answer 4

how low or high you perceive a sound to be

Question 5

pitch si unit

Answer 5

there is no si unit for pitch

Question 6

frequency si unit

Answer 6

hertz

Question 7

frequency

Answer 7

the number of waves produced in a given period of time

Question 8

infrasonic

Answer 8

frequency’s lower than 20Hz

Question 9

ultrasonic

Answer 9

frequencies higher than 20,000Hz

Question 10

Doppler effect

Answer 10

the apparent change in the frequency of a sound which is caused by the motion of the listener or the source of the sound

Question 11

loudness

Answer 11

how loud or soft sound is perceived to be

Question 12

loudness si unit

Answer 12

decibels

Question 13

ultrasonography

Answer 13

uses echos to “see” inside a patients body without performing surgery

Question 14

interference

Answer 14

the result of 2 or more waves overlapping

Question 15

constructive interference

Answer 15

when compressions of one wave overlap with the compressions of another wave the amplitude will be greater and the sound will be louder

Question 16

deconstructive interference

Answer 16

when the compressions of one wave overlap with the rarefaction of another wave the amplitude will be less and the sound will be more soft

Question 17

resonance

Answer 17

when an object vibrates at or near a resonant frequency of a second object causing the second object to vibrate

Question 18

amplitude

Answer 18

the amount of energy in a wave

Question 19

amplitude si unit

Answer 19

amplitude has no si unit

Question 20

wavelength

Answer 20

the distance between any two adjacent crests or compressions

Question 21

longitudinal

Answer 21

the particles vibrate along the same path the wave is traveling

Question 22

rarefaction

Answer 22

the area in the spring demonstrating with the loose area

Question 23

compression

Answer 23

the area in the spring demonstration with the dense area

Question 24

crest

Answer 24

the highest point on a wave

Question 25

trough

Answer 25

the lowest point between two crests

Question 26

mechanical wave

Answer 26

a wave in which the particles of the waves medium vibrate perpendicular to the direction the wave is traveling

Question 27

electromagnetic wave

Answer 27

waves which do not require a medium.

Question 28

sonar

Answer 28

uses reflected sound waves to locate underwater targets