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Attachment 16 – Hearing Conservation Quiz – Student Sheet
(50pts)
I. Write the question & answer briefly, or answer in a complete sentence or with diagrams as appropriate (2pts each)
1. Briefly diagram the movement of sound through the air. Be sure to label areas of compression and rarefaction.
2. What is Noise Induced Hearing Loss (NIHL)? Who is potentially at risk for NIHL?
3. How do a temporary and a permanent threshold shift differ?
4. What is the function of the middle ear ossicles? Provide the names and relative positions of the ossicles.
5. Define: Impulse sound
6. Specifically, what structures are damaged due to over-exposure to noise above 85dB? Where in the ear
are these structures located?
7. Use a sketch to illustrate the inverse square law as it pertains to sound.
8. Trace the path of “sound” as it travels from the stapes to the brain. (You may use words, a diagram or
both in presenting your answer)
9. In the conduction of sound, where does the transition from a mechanical to an electrical signal occur?
10. How is the energy used in generating a “sound” related to the amplitude of the wave?
II. Calculations – Show your work – NO CALCULATORS! (2pts each)
11. What is the formula for calculating sound intensity?
12. When the intensity of a sound increases by 1000x, this would represent an increase of how many decibels?
13. As the distance from the source increases 4x, how much does the intensity decrease?
14. How many times more intense is a sound that measures 20dB as compared to a sound of 70dB?
15. Apply the inverse square law to demonstrate the loss of sound intensity as the distance from the source triples.
What would be the new level of intensity, if the original intensity was144units.
III. Labs, activities, and other assignments (2pts each)
16. What are two things that you discovered by keeping your Noise Exposure Journal? (This response
should be related to hearing conservation)
17. Why is having a larger pinna (theoretically) advantageous? Explain how this should work.
18. During the construction of concert halls, why are the size, shape and texture of the walls and ceiling important
considerations?
19. What is the most important feature of a hearing protective device?
20. List two ways that NIHL can be avoided.
IV. True/ False, and CORRECT ALL FALSE (1pt each)
(In order to receive credit you must change the underlined portion to make the FALSE statements TRUE)
21. Only elderly people are susceptible to NIHL.
22. NIHL typically occurs so gradually that it may go unnoticed.
23. Hair cells recover quickly from noise induced damage.
24. One strategy to avoid NIHL is to move farther away from the source of the noise.
25. Beards and bushy side-burns do not impact the ability of ear muffs to protect against noise exposure.
V. Matching (Number, word, letter) EX – 55. dog Q ( 0.5 pt each)
26. decibel
a. outer ear
27. intensity
b. snail shaped structure of inner ear that holds the Organ of Corti
28. free radicals
c. transmits vibration to the oval window
29. pinna
d. converts mechanical energy into electrical signal
30. stapes
e. unit used to express the intensity of sound
31. tympanic membrane
f. includes ear plugs and ear muffs
32. Organ of Corti
g. also called the ear drum
33. oval window
h. destructive molecules that cause hair cell death
34. hearing protective equipment
i. vibrations cause movement of cochlear fluid
35. cochlea
j. power per unit area
Attachment 16 – Hearing Conservation Quiz – TEACHER SHEET
ANSWER KEY (50pts)
I. Write the question & answer briefly, or answer in a complete sentence or with diagrams as appropriate (2pts each)
1.
2. Hearing loss caused by exposure to sounds that are too loud, or loud sounds that last a long time. People of all
ages are potentially at risk for NIHL.
3. Your hearing will recover from a temporary threshold shift, while a permanent threshold shift means that you will
no longer be able to hear sounds in the affected range/frequency
4. The middle ear ossicles amplify and transmit the vibrations from the tympanic membrane to the oval window.
The malleus (near tympanic membrane), incus between malleus and stapes, stapes (near oval window)
5. An impulse sound is noise consisting of single bursts with a duration of less than one second with peak levels
15dB higher than background noise.
6. Hair cells are damaged due to over-exposure to noise above 85dB. The hair cells are part of the Organ of Corti,
(located in the cochlea).
7. As the distance from the source doubles the area quadruples ~ Recall that Intensity is P/A , therefore, you will
have ¼ the intensity at 2r
8.Stapes→Oval Window→ Cochlear Fluid→ Basilar Membrane→ Organ of Corti (Hair Cells) →Auditory
Nerve→Brain
9. The transition from a mechanical to an electrical signal occurs at the Organ of Corti.
10. As the energy increases the amplitude of the way increases
II. Calculations – Show your work – NO CALCULATORS! (2pts each)
11. I=P/A (Area might be represented as 4πr2)
12. 30dB
13. The intensity will decrease by 16x (Will be 1/16 of the original intensity)
14. 105 times more intense
15. 16units
III. Labs, activities, and other assignments (2pts each)
16. RESPONSES WILL VARY
17. A larger pinna will allow you to hear better. A larger pinna will allow you to “collect” more sound.
18. These features all influence how sound will be experienced by the audience
19. Acceptability for regular use
20. Move away from the source; Reduce exposure time; Avoid loud noise
IV. True/ False, and CORRECT ALL FALSE (1pt each)
(In order to receive credit you must change the underlined portion to make the FALSE statements TRUE)
21. FALSE / All
22. TRUE
23. FALSE / Do not recover
24. TRUE
25. FALSE / Do
IV. Matching (Number, word, letter) EX – 55. dog Q ( 0.5 pt each)
26. decibel
E
27. intensity
J
28. free radicals
H
29. pinna
A
30. stapes
C
31. tympanic membrane
G
32. Organ of Corti
D
33. oval window
I
34. hearing protective equipment
F
35. cochlea
B