1138 Questions & Blanks

Question 1

Why do some media conduct sound waves better than others?

Answer 1

Some have better elasticity.

Question 2

How does the increase in temperature affect the speed of sound.

Answer 2

It increases the speed of sound.

Question 3

Speed of sound

Answer 3

slow in air and wood
medium in alcohol, hydrogen, and water
fast in brass, granite, glass, and steel
insane in beryllium (over 9,000)

Question 4

People can hear sounds roughly between:

Answer 4

20 and 20,000 Hz

Question 5

What is sound intensity?

Answer 5

The quantity of energy passing through one cm^2 each second.

Question 6

velocity = (frequency)(wavelength)

Answer 6

.

Question 7

How is sound energy lost as sound waves expand?

Answer 7

Some sound is absorbed into the air and converted to heat energy

Question 8

To what kinds of waves does the Doppler effect apply?

Answer 8

All

Question 9

What property of waves is affected by reflection

Answer 9

direction

Question 10

How does an echo differ from a reverberation?

Answer 10

An echo is a single repetition of an initial sound, while a reverberation is a prolonged rumble of many echoes.

Question 11

What can be done in auditoriums to reduce echoes?

Answer 11

Install sound absorbent material

Question 12

The ______________ allows sound waves to be collected and refocused

Answer 12

property of reflection

Question 13

How is the use of radar similar to the use of a foghorn in detecting obstacles?

Answer 13

They both send out and collect waves.

Question 14

How does sonar measure distances to underwater obstacles?

Answer 14

It measures the time that it takes for sound waves to return

Question 15

How are seismic waves helpful to us?

Answer 15

studying the internal structure of the Earth

finding oil

Question 16

What is refraction?

Answer 16

change in direction of a wave as it passes from one medium to another

Question 17

When a wave enters a new medium, what will always change?

Answer 17

speed

Question 18

Sound waves which lose speed as they enter a new substance bend _____________

Answer 18

toward the normal line

Question 19

How does refraction affect sound at night?

Answer 19

It bends sound waves toward the ground

Question 20

S = vt

Answer 20

.

Question 21

The fundamental frequency of an object depends upon _____________

Answer 21

length
mass
tension

Question 22

What is an overtone?

Answer 22

a sound with a pitch that is a simple multiple of the fundamental frequency

Question 23

The third overtone is equal to the

Answer 23

fourth harmonic

Question 24

the tenth harmonic is equal to the

Answer 24

ninth overtone

Question 25

Define resonance

Answer 25

the inducing of motion that occurs when the vibrations produced by one object act upon a second object and cause it to vibrate as well

Question 26

What must be true for resonance to occur?

Answer 26

if the fundamental frequency of two objects are the same or

if the vibration rate of one of them is an overtone of the other

Question 27

Words used to describe a musical note

Answer 27

Pitch
Quality
Loudness

Question 28

Upon what does the quality of a musical note depend?

Answer 28

the number and intensity of overtones

Question 29

Human voices differ because of:

Answer 29

quality and resonance

Question 30

The interaction of two waves is called:

Answer 30

interference

Question 31

The things that typify music

Answer 31

Rhythm
Melody
Harmony

Question 32

What effect does the length of a string have on the frequency produced?

Answer 32

longer strings have lower tones

shorter strings have higher tones

Question 33

How do a guitar and a piano differ in producing a multitude of notes?

Answer 33

A guitar has a few strings which can be altered in length, while a piano has many strings of different lengths

Question 34

Use to change the pitch of wind instruments

Answer 34

valves
tubes
slides

Question 35

The difference between two frequencies of objects that are sounded together

Answer 35

beats

Question 36

wavelength = length of object times 4

Answer 36

2.5 meter organ pipe = 10 m/wave

Question 37

Under what circumstances does the inverse square law for sound fail entirely?

Answer 37

when the sound waves are not free to expand in a sphere

Question 38

____ and ____ are synonymous

Answer 38

Pitch

frequency