Characteristics of Sound Waves

Question 1

The measure of the frequency of sound (vibrations per second).

Answer 1

Pitch

Question 2

High pitch = _____ frequency and vice versa

Answer 2

high

Question 3

20 Hz - 20,000 Hz

Answer 3

audible frequency range

Question 4

Sound waves with frequencies below 20 Hz are called?

Answer 4

infrasonic

Question 5

Sound waves with frequencies above 20,000 Hz are called?

Answer 5

ultrasonic

Question 6

The natural frequency of an object is determined by the _____ energy required for it to vibrate.

Answer 6

minimum

Question 7

A condition that exists when the frequency of a force applied to a system matches the natural frequency of vibration of the system.

Answer 7

resonance

Question 8

Doppler Effect was named after?

Answer 8

Christian Doppler who proposed it in 1842

Question 9

The change in frequency of a sound wave due to the relative motion between the source and the receiver.

Answer 9

Doppler Effect

Question 10

Determined by the intensity of a sound.

Answer 10

loudness

Question 11

The measure of the amplitude of a sound wave.

Answer 11

loudness

Question 12

Loudness is measured in?

Answer 12

decibels (dB)

Question 13

Sound intensity of 0 dB

Answer 13

threshold of hearing

Question 14

Sound intensity of 120 dB

Answer 14

threshold of pain

Question 15

The quality of sound

Answer 15

timbre / tone color

Question 16

Points with no displacement

Answer 16

nodes

Question 17

Points with maximum displacement

Answer 17

antinodes

Question 18

1st Harmonic (open)

Answer 18

2L

Question 19

2nd Harmonic (open)

Answer 19

L

Question 20

3rd Harmonic (open)

Answer 20

2L / 3

Question 21

4th Harmonic (open)

Answer 21

L / 2

Question 22

For a pipe, only ____ multiples of the fundamental frequency are produced.

Answer 22

odd

Question 23

1st Harmonic (closed)

Answer 23

4L

Question 24

2nd Harmonic (closed)

Answer 24

4L / 3

Question 25

3rd Harmonic (closed)

Answer 25

4L / 5