7-8 Assessment

1) Lab

Download the following document and complete the lab:

File:Room Acoustics Lab.pdf

    You will need the following materials:
    - Computer
    - Odeon Program
    - Logger Pro
    - Lab Pros (with batteries)
    - SIL Meter
    - Headphones, optional
    

Taken from:

2) Journal

Now that we have completed our seventh (and final) unit we are to reflect on what we have learned. Please go to the discussion area and answer the following questions. Your answer should be approximately 100-200 words. Also, please read through some of the other journal posts and comment on any areas where you are able to add new insight.

  Journal Questions:
  1- How does the environment affect the sound produced?
  2- If you were to build a music hall, what factors would you consider?
  3- Are there any areas which are confusing you?  If so, what in particular?
  4- What do you look forward to learning more about?
  5- How do you plan on using this information in your musical career?

Talk: Journal Unit 7 Acoustics

3) Practice Questions for Unit 7:

1. The time required for the intensity of an impulsive sound to decrease by a factor of one million is called the:

(a) initial-time-delay gap

(b) intimacy factor

(c) noise reduction

(e) reverberation time

(f) none of the above

7-8: 1 SEE ANSWER

2. "Hot spots" are areas in an enclosure where:

(a) time delays are greater than 40 m/s

(b) the background noise interferes with the sound program

(c) sound energy is focused

(d) none of the above

7-8: 2 SEE ANSWER

3. For an environment to display "brilliance", the high frequencies must be prominent and decay slowly.

(a) True

(b) False

7-8: 3 SEE ANSWER

4. Calculate the reverberation time for a room 20 m by 15 m by 8 m. The walls are painted concrete block, the ceiling is plaster upon concrete, and the floor is marble. There is no furniture, windows, doors or people present. The frequency is 500 Hz.

7-8: 4 SEE ANSWER

5. Consider the room mentioned in question four. Lets replace the walls with acoustic tiles (everything else stays the same). What is the new reverberation time?

7-8: 5 SEE ANSWER

1. REDIRECT The Physics of Music