Sound Review

What type of wave is a sound wave?

Mech

anical a

nd...

Mech

anical a

nd...

Electr

omagneti...

Electr

omagneti...

20%

0%5%

75%1. Mechanical and Transverse

2. Mechanical and Longitudinal

3. Electromagnetic and Transverse

4. Electromagnetic and Longitudinal

The main factor that determines the speed of a sound wave is…

The amplitude

The frequency

The intensit

y

The properti

es...

The wave

length

0%

67%

11%

22%

0%

1. The amplitude2. The frequency3. The intensity4. The properties of

the medium5. The wavelength

Which of the following factors determines the pitch of a sound?

Amplitude

Intensit

y

Frequency

Phase Sp

eed

10%15%

0%0%

75%1. Amplitude2. Intensity3. Frequency4. Phase5. Speed

The standing wave pattern shown below represents which harmonic?

First

Seco

nd

Third

Fourth Fi

fth

0% 0%

16%

84%

0%

1. First2. Second 3. Third 4. Fourth5. Fifth

What two characteristics determine if a sound can be heard?

Frequency

and ...

Frequency

and ...

Intensit

y and ...

Intensit

y and ...

Amplitude and ...

5%

79%

0%

11%5%

1. Frequency and wavelength

2. Frequency and Intensity

3. Intensity and Power4. Intensity and

Amplitude5. Amplitude and

wavelength

Participant Scores500 Rusk500 21. Yonkers500 Stafford400 O'Callaghan400 Lambert400 Ward400 Opet400 French400 20. Will300 Houlahan

The Doppler Effect describes…

The ability o

f...

One vibrating ...

The form

ation ...

Perceive

d freq...

The difference...

0%5%

0%

89%

5%

1. The ability of a single pipe to play multiple notes

2. One vibrating object forcing another to vibrate

3. The formation of beat patterns

4. Perceived frequency changes due to relative motion

5. The differences between notes on a flute and a trumpet

While driving, you hear a police car siren approaching from behind. If the siren produces

a 1500 Hz sound, you will hear a sound…

Greater t

han 1...

Less

than 1500...

Equal

to 1500 ...

You will

not b...

63%

0%

11%

26%

1. Greater than 1500 Hz2. Less than 1500 Hz3. Equal to 1500 Hz4. You will not be able

to hear this sound

Front row at a rock concert may reach upwards of 120 dB. How many times more intense is this

than typical conversation at 60 dB?

1,000,000x 2x 60x

10x 600x

81%

0% 0%0%

19%

1. 1,000,000x2. 2x3. 60x4. 10x5. 600x

Four machines operating simultaneously produce a 80 dB sound. How many of these machines would

it take to produce a 100 dB sound?

40 16 80400 5

10%5%

15%

60%

10%

1. 402. 163. 804. 4005. 5

The human voice has been shown to be capable of shattering a glass. This is possible due to…

Resonance

Doppler Effect

Interfe

rence

Harmonics

Timbre

90%

0% 0%10%

0%

1. Resonance2. Doppler Effect3. Interference4. Harmonics5. Timbre

Participant Scores1000 Rusk1000 21. Yonkers1000 Stafford900 Lambert900 Ward900 Opet800 O'Callaghan800 French700 Fejko700 Berger

You are traveling in a car near by a moving train. The train sounds its whistle, but you fail to hear

the Doppler effect. This may be because…

You are travel...

You are travel...

You are travel...

You are travel...

You are travel...

0%

11%

0%5%

84%1. You are traveling away from the train too fast to detect it

2. You are traveling towards the train too fast to detect it

3. You are traveling at the same speed as the train

4. You are traveling away from the train too slowly to detect it

5. You are traveling towards the train to slowly to detect it

At room temperature, sound will travel most slowly through which of the following?

Iron

Water

Aluminum

Mercu

ry

Helium

15%

5%

65%

10%5%

1. Iron2. Water3. Aluminum4. Mercury5. Helium

Two pipes are exactly the same length, but one is open and the other is closed at one end. Which pipe’s fundamental frequency

will be the higher pitch?44%39%

17%

1. Open pipe2. Closed pipe3. Both fundamentals

will be the same

An observer is sitting in a train. The train blows its whistle as it accelerates from rest along the

track moving faster and faster. The frequency of sound detected by the observer compared to

the original whistle will be…

The same

Higher

Lower

Zero

79%

0%

16%5%

1. The same2. Higher3. Lower4. Zero

If the distance from a source of sound is doubled, the intensity of the sound will change by a factor of…

2 4 ½ ¼

No change

5%10% 10%

60%

15%

1. 22. 43. ½4. ¼5. No change

Participant Scores1500 Stafford1400 Rusk1400 21. Yonkers1300 Opet1200 O'Callaghan1200 Ward1200 French1100 Lambert1100 Fejko1100 Berger

A string on a guitar produces a 440 Hz note when plucked. What would be the 4th harmonic of this string?

440 Hz

110 Hz

880 Hz

1760 Hz

There is no 4t..

.

5%0% 0%

90%

5%

1. 440 Hz2. 110 Hz3. 880 Hz4. 1760 Hz5. There is no 4th

harmonic for a string

A flute of length 60.0 cm behaves as an open pipe. What is the 2nd harmonic of

this flute? (assume v = 343 m/s)

285 Hz

570 Hz

143 Hz

120 Hz

240 Hz

32%

58%

0%0%

11%

1. 285 Hz2. 570 Hz3. 143 Hz4. 120 Hz5. 240 Hz

If the pipe represented below has a length of 3.0 m, what is the wavelength of the

harmonic shown?

1.0 m 2.0 m

3.0 m 1.5 m

0.67 m

11%

58%

0%

32%

0%

1. 1.0 m2. 2.0 m3. 3.0 m4. 1.5 m5. 0.67 m

A 100 W speaker is operating at full power. What is the intensity of sound 3.0 m away?

0.88 W/m

2

707 W/m

2

72 W/m

2

2.7 W/m

2

0 W/m

2

74%

16%

0%5%5%

1. 0.88 W/m2

2. 707 W/m2

3. 72 W/m2

4. 2.7 W/m2

5. 0 W/m2

A piano tuner uses a 320 Hz tuning fork to tune a string. If she hears 3 beats per second and a

lower pitch than expected, the string is vibrating at…

320 Hz

323 Hz

317 Hz

960 Hz

107 Hz

0% 0%5%

11%

84%

1. 320 Hz2. 323 Hz3. 317 Hz4. 960 Hz5. 107 Hz

Participant Scores1900 Rusk1900 21. Yonkers1800 Opet1800 Stafford1700 O'Callaghan1700 French1600 Ward1600 Berger1500 Fejko1400 Lambert

500 Point Final Question!!!How many times more intense is a 65 dB sound compared to a 60

dB sound?

5.0 x 3.2 x

1.1 x 105 x

10-5 x

15%

25%

15%15%

30%

1. 5.0 x2. 3.2 x3. 1.1 x4. 105 x5. 10-5 x

*You will not be asked to do this on the test!!!

Participant Scores2400 Rusk2300 Stafford2200 French2000 Fejko1900 21. Yonkers1900 Lambert1800 Opet1700 O'Callaghan1600 Ward1600 Berger