5-6 Assessment

1) Lab

Download the following document and complete the lab:

File:Standing Waves In An Air Column.pdf

    You will need the following materials:
    - Virtual Sound Waves Lab
    - Logger Pro
    - Computer with internal capability
    - Calculator
    - Graph paper 
    - Pencil
    - Headphones, optional
    - Note: the Virtual Sound Waves Lab is available with a free trial at Virtual Labs

    You will need to know the following definitions/ formulas/ symbols:
    - Percent Error formula
    - The symbol for wavelength

Taken from:

2) Journal

Now that we have completed our fifth 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- Using physic terms, how would you explain the difference in vibrational modes of stretched stings, pipes, and stretched membranes?
    2- What instruments produced sounds with stretched strings? Pipes? Stretched membranes? 
    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 5 Strings, Pipes, & Membranes

3) Practice Questions for Unit 4:

1. The frequencies from which a complex tone is constructed are called:

(a) harmonics if the frequencies are not whole number multiples of the lowest frequency

(b) overtones if the frequencies are whole number multiples of the lowest frequency

(c) beats

(d) none of the above

5-6: 1 SEE ANSWER

2. The lowest frequency that can be produced by a vibrating string is called the

(a) First harmonic

(b) Fundamental

(c) First overtone

(d) (a) and (b)

(e) None of the above

5-6: 2 SEE ANSWER

3. The family of frequencies produced by a drum head are harmonically related.

(a) True

(b) False

5-6: 3 SEE ANSWER

4. A complex tone is analyzed into its components. What is the number of the sixth component, f6, if...

(a) f6 is a harmonic?

(b) f6 is an overtone?

5-6: 4 SEE ANSWER

5. One of the strings on a piano is 96 cm in length. If the string is vibrating in its sixth vibrational mode, what is the wavelength of the standing wave on the string?

5-6: 5 SEE ANSWER

6. A string has a linear density of 0.035 kg/m. If it is stretched to a tension of 667 N, what is the velocity of the wave on the string?

5-6: 6 SEE ANSWER

7. A conical tube has a length of 50 cm. The cone is cut 20 cm from the tip, thereby forming a truncated cone. The lowest frequency with which the enclosed air oscillates is 428 Hz, which occurs when the speed of sound is 345 m/s. What other resonant frequencies does this truncated cone possess?

5-6: 7 SEE ANSWER

Continue: #REDIRECT 6-1 Objective

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