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

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(Part 1)
(Part 2)
Line 27: Line 27:
 
<quiz display=simple>
 
<quiz display=simple>
  
{'''A sound wave permanently transports (i.e. not just a back and forth oscillation) what from one place to another?'''
+
{'''A travelling wave permanently transports (i.e. not just a back and forth oscillation) what from one place to another?'''
 
|type="[]"}
 
|type="[]"}
 
-(a) Air
 
-(a) Air
Line 38: Line 38:
 
|| <span style="color:#00ff00">''Correct ''</span>
 
|| <span style="color:#00ff00">''Correct ''</span>
  
{'''In acoustics, the "frequency" of a sound wave means:'''
+
{'''The "frequency" of a wave means:'''
 
|type="[]"}
 
|type="[]"}
 
-(a) How often a sound happens
 
-(a) How often a sound happens
Line 49: Line 49:
 
|| <span style="color:#00ff00">''Correct ''</span>
 
|| <span style="color:#00ff00">''Correct ''</span>
  
{'''In acoustics, the "wavelength" of a sound wave means:'''
+
{'''The "wavelength" of a wave means:'''
 
|type="[]"}
 
|type="[]"}
 
-(a) Where a sound happens
 
-(a) Where a sound happens
Line 60: Line 60:
 
|| <span style="color:#FF0000">''No, that's the frequency''</span>
 
|| <span style="color:#FF0000">''No, that's the frequency''</span>
  
{'''In acoustics, the "amplitude" of a sound wave means:'''
+
{'''The "amplitude" of a wave means:'''
 
|type="[]"}
 
|type="[]"}
 
-(a) How far apart the waves are
 
-(a) How far apart the waves are
Line 66: Line 66:
 
-(b) The distance between two successive wave crests.
 
-(b) The distance between two successive wave crests.
 
|| <span style="color:#FF0000">''No, that's the wavelength''</span>
 
|| <span style="color:#FF0000">''No, that's the wavelength''</span>
+(c) The magnitude of the pressure disturbance.
+
+(c) The maximum distance from the equilibrium (no wave) position.
 
|| <span style="color:#00ff00">''Correct''</span>
 
|| <span style="color:#00ff00">''Correct''</span>
 
-(d) The number of wave crests that pass in a given time period.
 
-(d) The number of wave crests that pass in a given time period.
 
|| <span style="color:#FF0000">''No, that's the frequency''</span>
 
|| <span style="color:#FF0000">''No, that's the frequency''</span>
  
{'''In acoustics, the wavelength multiplied by the frequency is:'''
+
{'''For a wave, the wavelength multiplied by the frequency is:'''
 
|type="[]"}
 
|type="[]"}
+(a) The speed of the sound
+
+(a) The wave speed
 
|| <span style="color:#00ff00 ">''Correct''</span>
 
|| <span style="color:#00ff00 ">''Correct''</span>
-(b) The pitch.
+
-(b) The amplitude.
 
|| <span style="color:#FF0000">''No''</span>
 
|| <span style="color:#FF0000">''No''</span>
-(c) The loudness.
+
-(c) The energy.
 
|| <span style="color:#FF0000">''No''</span>
 
|| <span style="color:#FF0000">''No''</span>
 
-(d) The number of wave crests that pass in a given time period.
 
-(d) The number of wave crests that pass in a given time period.
 
|| <span style="color:#FF0000">''No, that's the frequency''</span>
 
|| <span style="color:#FF0000">''No, that's the frequency''</span>
  
{'''The psycho-acoustic response to the frequency of sound is related to our perception of:'''
+
{''In a transverse wave:'''
 
|type="[]"}
 
|type="[]"}
+(a) Pitch
+
-(a) The particles of the medium travel at the wave speed.
|| <span style="color:#00ff00 ">''Correct''</span>
+
-(b) Sound speed.
+
|| <span style="color:#FF0000">''No''</span>
+
-(c) Loudness.
+
|| <span style="color:#FF0000">''No''</span>
+
-(d) The number of wave crests that pass in a given time period.
+
|| <span style="color:#FF0000">''No, we cannot hear individual wave crests''</span>
+
 
+
{'''The psycho-acoustic response to the waveform or distribution of sound frequencies is related to our perception of:'''
+
|type="[]"}
+
-(a) Wavelength
+
 
|| <span style="color:#00ff00 ">''No''</span>
 
|| <span style="color:#00ff00 ">''No''</span>
-(b) Sound speed.
+
-(b) The particles of the medium oscillate in the wave direction.
 
|| <span style="color:#FF0000">''No''</span>
 
|| <span style="color:#FF0000">''No''</span>
-(c) Loudness.
+
+(c) The particles of the medium oscillate at 90 degrees to the wave direction.
|| <span style="color:#FF0000">''No''</span>
+
|| <span style="color:#FF0000">''Correct''</span>
+(d) Timbre
+
-(d) The particles of the medium migrate in the direction of the wave
|| <span style="color:#00ff00">''Correct''</span>
+
|| <span style="color:#FF0000">''No, that's the frequency''</span>
  
{'''The psycho-acoustic response to the pressure amplitude or intensity of sound is related to our perception of:'''
 
|type="[]"}
 
-(a) Pitch
 
|| <span style="color:#00ff00 ">''Correct''</span>
 
-(b) Sound speed.
 
|| <span style="color:#FF0000">''No''</span>
 
-(c) Key
 
|| <span style="color:#FF0000">''No''</span>
 
+(d) Loudness.
 
|| <span style="color:#00ff00">''Correct''</span>
 
  
  
 
</quiz>
 
</quiz>

Revision as of 16:55, 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.

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.



2.

"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


{ |type="{}"} "Vibration" means the regular back-and-forth movement of an object that can be defined by its { amplitude } (i.e. the maximum { distance } it moves from equilibrium) and { frequency } (the number of complete oscillations in a given { time }).

amplitude, buzz, distance, frequency, pressure, sound, time, wavelength. </quiz>

Part 2

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

1. A travelling 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. The "frequency" of a 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. The "wavelength" of a 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. The "amplitude" of a 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 maximum distance from the equilibrium (no wave) position.
Correct
(d) The number of wave crests that pass in a given time period.
No, that's the frequency

5. For a wave, the wavelength multiplied by the frequency is:

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

6. In a transverse wave:'

(a) The particles of the medium travel at the wave speed.
No
(b) The particles of the medium oscillate in the wave direction.
No
(c) The particles of the medium oscillate at 90 degrees to the wave direction.
Correct
(d) The particles of the medium migrate in the direction of the wave
No, that's the frequency

Your score is 0 / 0