Unit 3-Waves And Sound

Question 1

Periodic motion

Answer 1

Is also called vibrations, cycles, or oscillations. Repeated motion of particles or mechanical systems in cycles around a rest position

Question 2

Transverse vibrations

Answer 2

The motion of the vibrating object is perpendicular to its length

Question 3

Longitudinal vibrations

Answer 3

The motion of the object is parallel to its length

Question 4

Amplitude A

Answer 4

From rest position to the maximum distance

Question 5

Damping

Answer 5

The displacement from equilibrium position becomes less and less overtime due to unbalanced forces and loss of energy

Question 6

Natural resonant frequency

Answer 6

When objects are allowed to vibrate freely

Question 7

Sympathetic vibration

Answer 7

A responding vibration with the same resonant frequency

Question 8

In phase

Answer 8

Two vibrating objects can have identical amplitude and frequency’s but are different because they are never at the same point in their cycles at the same time

Question 9

Frequency f

Answer 9

The number of cycles per second in hertz

Question 10

Complex waves

Answer 10

A combination of transverse and longitudinal waves

Question 11

Mechanical waves

Answer 11

A disturbance that transfers energy through a medium by means of vibrations of the particles of a medium that repeat

Question 12

Medium

Answer 12

Type of material that is a solid liquid or gas

Question 13

Sound

Answer 13

Auditory sensation in ones ear

Question 14

Loudness

Answer 14

Response of the ear to sounds

Question 15

High frequency

Answer 15

Higher note

Question 16

Low frequency

Answer 16

Lower note

Question 17

Tone or timbre

Answer 17

A measure of the quality of a note

Question 18

Audible

Answer 18

Sounds within the range of human hearing (20Hz-20000Hz)

Question 19

Infrasonic

Answer 19

Sounds below audible range

Question 20

Ultrasonic

Answer 20

Sounds above audible range

Question 21

Speed of sound

Answer 21

331m/s

Question 22

Speed of light

Answer 22

300 000 000m/s

Question 23

Principle of superposition

Answer 23

At any point, the amplitude of two interfering waves is the sum of the amplitude of the individual waves

Question 24

Constructive interference

Answer 24

The waves add to each other

Question 25

Destructive interference

Answer 25

The waves take away from each other

Question 26

Beat

Answer 26

Two waves slightly out of phase

Question 27

Doppler effect

Answer 27

When the source producing waves travels through the median at the same time as the waves are produced

Question 28

Standing waves

Answer 28

Produced when two waves of the same frequency moving in opposite directions meet

Question 29

Node

Answer 29

Maximum destructive interference

Question 30

Antinode

Answer 30

Maximum constructive interference

Question 31

Resonant lengths

Answer 31

When frequency is kept the same

Question 32

Stringed instruments

Answer 32

The sound is made from plucking striking or bowing a string

Question 33

Wind instruments

Answer 33

The sound is produced from standing waves in a tube or column

Question 34

Woodwind instruments

Answer 34

The sound is produced from moving air past a reed or forced through a whistle

Question 35

Brass instrument

Answer 35

The sound is produced from buzzing lips

Question 36

Human Voice

Answer 36

Sounds from air in lungs moving through an air column closed at one end

Question 37

Percussion instruments

Answer 37

Sound from striking something