Difference between revisions of "Course:PHYS341/2018/Assignments/A1"

From UBC Wiki
Jump to: navigation, search
(Part 1)
(Part 1)
Line 14: Line 14:
 
|type="{}"}
 
|type="{}"}
 
In colloquial use, the term "noise" refers to { unwanted } sound. In science of acoustics, "noise" means { random } sound with no particular { frequency } or { information } content that tends to obscure the sound of interest. <br /><br />
 
In colloquial use, the term "noise" refers to { unwanted } sound. In science of acoustics, "noise" means { random } sound with no particular { frequency } or { information } content that tends to obscure the sound of interest. <br /><br />
''amplitude, frequency, information, loud, random, quiet, unwanted.'''<hr /><br /><br />
+
'''amplitude, frequency, information, loud, random, quiet, unwanted.'''<hr /><br /><br />
  
 
{  
 
{  

Revision as of 16:31, 3 January 2018

Training Problems for January 12th Quiz

Part 1

Basic Concepts. For questions 1 to 3, fill in the gaps in each paragraph, choosing from the set of words/phrases at the end of each question (each of which may be used more than once) to form the most correct, precise statements. In the case where two words can be interchanged with no change in meaning, place them in alphabetical order (the code cannot handle more than one correct answer!).

1.

Sound is a that through a . Sound can through air as a rapid fluctuation in air , and we detect it with our , if the of the fluctuations lie in the range.

audible, disturbance, ears, frequency, medium, propagate, propagates, pressure.




2.

In colloquial use, the term "noise" refers to sound. In science of acoustics, "noise" means sound with no particular or content that tends to obscure the sound of interest.

amplitude, frequency, information, loud, random, quiet, unwanted.



3.

A sound wave in air is a disturbance that through the medium. Waves carry and from one place to another, with no net movement of the substance of the .

amplitude, energy, frequency, information, medium, pattern, pressure, propagates, wavelength.



4.

"Music" means many things to different people, but basically it is , in a meaningful way.

culturally, deliberately, harmonically, organized, pressure, sound, sung, technically, written.

Your score is 0 / 0


Part 2

For the following questions, select all statements that are correct. There may be more than one.

1. A sound wave permanently transports (i.e. not just a back and forth oscillation) what from one place to another?

(a) Air
No - no matter is permanently moved
(b) Atoms
No - no matter is permanently moved
(c) Energy
Correct
(d) Information
Correct

2. In acoustics, the "frequency" of a sound wave means:

(a) How often a sound happens
Too vague
(b) The distance between two successive wave crests.
No, that's the wavelength
(c) The time between two successive wave crests.
That's the period
(d) The number of wave crests that pass in a given time period.
Correct

3. In acoustics, the "wavelength" of a sound wave means:

(a) Where a sound happens
Too vague
(b) The distance between two successive wave crests.
Correct
(c) The distance between two successive wave troughs.
Also correct
(d) The number of wave crests that pass in a given time period.
No, that's the frequency

4. In acoustics, the "amplitude" of a sound wave means:

(a) How far apart the waves are
No
(b) The distance between two successive wave crests.
No, that's the wavelength
(c) The magnitude of the pressure disturbance.
Correct
(d) The number of wave crests that pass in a given time period.
No, that's the frequency

5. In acoustics, the wavelength multiplied by the frequency is:

(a) The speed of the sound
Correct
(b) The pitch.
No
(c) The loudness.
No
(d) The number of wave crests that pass in a given time period.
No, that's the frequency

6. The psycho-acoustic response to the frequency of sound is related to our perception of:

(a) Pitch
Correct
(b) Sound speed.
No
(c) Loudness.
No
(d) The number of wave crests that pass in a given time period.
No, we cannot hear individual wave crests

7. The psycho-acoustic response to the waveform or distribution of sound frequencies is related to our perception of:

(a) Wavelength
No
(b) Sound speed.
No
(c) Loudness.
No
(d) Timbre
Correct

8. The psycho-acoustic response to the pressure amplitude or intensity of sound is related to our perception of:

(a) Pitch
Correct
(b) Sound speed.
No
(c) Key
No
(d) Loudness.
Correct

Your score is 0 / 0