Waves and Sound

Question 1

Wave

Answer 1

Transfers energy through medium - medium does not move

Question 2

Transverse Waves

Answer 2

vibrate perpendicular to motion

Question 3

Longitudinal Waves

Answer 3

vibrate parallel to motion

Question 4

Energy of a wave

Answer 4

determined by AMPLITUDE

Question 5

Distance between a crest and crest

Answer 5

1 λ (wavelength)

Question 6

Distance between a crest and trough

Answer 6

1/2 λ

Question 7

Sound

Answer 7

• made of compressions and rarefractions of air particles of a sound source vibrating
• Longitudinal waves

Question 8

PITCH determines

Answer 8

FREQUENCY

Question 9

AMPLITUDE determines

Answer 9

SOUND INTENSITY & Energy

Question 10

Range of hearing

Answer 10

20 - 20,000 Hz

Question 11

Infrasonic

Answer 11

Below 20 Hz

Question 12

Ultrasonic

Answer 12

Above 20,000 Hz

Question 13

Mach #

Answer 13

Travels at “n” times the speed of sound

Question 14

Sonic Boom

Answer 14

Travel past the speed of sound

Question 15

Sound Intensity

Answer 15

sound energy/unit area
- logarithmic

Question 16

4 Bels to 8 Bels

Answer 16

x10^4 or 10,000

Question 17

Principle of Superposition

Answer 17

The amp. of interfering waves is the SUM of the individual waves

Question 18

Standing Waves

Answer 18

2 waves of the same frequency interfere

Question 19

Nodes

Answer 19

Max. destructive interference

Question 20

Antinodes

Answer 20

Max. constructive interference

Question 21

Fundamental Frequency

Answer 21

f1 = first harmonic

Question 22

First overtone

Answer 22

2nd harmonic

Question 23

Closed Air Column

Answer 23

node @ closed end & antinode @ open
L1c = 1/4λ
f1 =Vsound/ 4L
f2 =3f1
f3 = 5f1

Question 24

Open Air Column

Answer 24

antinodes @ both ends
L1o = 1/2 λ
f1 = vsound/ 2L
f2 = 2f1
f3 = 3f1