Homework Chapter 12 Sound Characteristics
1. Answer the opening question on pg 328 with what you think right now:
2. What are the three aspects of sound?
3. What does speed of sound depend on?
4. Read Conceptual Example 12-1 and explain it here:
5. What is loudness?
6. What is pitch?
7. What is the audible range for humans?
8. What is ultrasonic?
9. Read Example 12-2. Explain how they derived the solution or solve the
example here:
10. In a ___________________________________________ the pressure is higher
than normal and in _______________________________________________
pressure is less than normal.
11.
What is infrasonic and why can they be scary?
Do problems 1 and 5 on pg. 354
Intensity of Sound
1. Define intensity:
2. What is intensity measured in?
3. What is the human range of intensity?
4. Explain decibels:
5. Look at Example 12-3. Show how to solve this type of problem:
6. Look at Example 12-4 and solve here:
7. Explain conceptual example 12-5:
8. Work through Example 12-6, explain why you used the equation you did:
9. Read example 12-7 and explain how sensitive the human ear is!!!
Do problems 10, 15 and 17
The Ear and its Response
1. What is the function of the ear?
2. What are the three main divisions of the ear:
3. Describe how the ear works:
4. Describe how the loudness control on a stereo uses frequencies to give
people a more normal sounding balance at low frequencies:
Do problems 23
Sources of Sound: Stringed instruments
1. What is a fundamental frequency?
2. What happens when you put your finger on a string of guitar?
3. Read example 12-8 and show what equations were used to determine
string length?
4. Solve example 11-9 below:
Do problems 27 and 33