Download Scoring Guide

Scoring Guide:
2. Following the web guide through each activity on this website. Follow the interactive
suggestions on each page. Answer the questions below as you go:
Start with “What’s That Sound?”
a. How do the sounds change for a person with hearing loss?
b. Read “How Do You Hear?” Draw the eardrum, hammer, anvil, stirrup and
cochlea. Draw the hair cells in the correct place. Hairs should be drawn in
Cochlea.
c. How is sound transmitted through the ear? Hits the eardrum, wiggles the
hammer, which move the anvil and the stirrup. The stirrup passes the vibration to the
cochlea which is lined with hair cells. When they vibrate, a message is sent to the
auditory nerve to the brain.
d. How is hearing damaged? Loud sounds
e. Go to “How Loud is Too Loud”. List three sounds that are too loud: most of
them
f. How is sound carried? In waves that move outward.
g. Skip the next page.
h. What are two ways to measure a sound wave? Amplitude and frequency
i. What is another way to describe amplitude besides “forceful”?
What unit is amplitude measured in? decibels dDB
loudness
j. What is frequency? How often waves are received, short wavelengths have
higher frequency.
k. How does a frequency of 262 Hz compare to the sound of 4186 Hz? It is lower
in pitch.
l. Besides frequency and amplitude, what else affects hearing damage? duration
m. In general, the correct responses in “Rock Your World” are related to: protect
your hearing.
n. Go to: http://www.egopont.com/hearing_tests.php?soundID=500&lang=en
Read the left had side the page and make sure you do the loudness test. Be
sure the volume on your computer is set at a normal range. Turn it down if it
is uncomfortable or stop. What is the frequency range of your hearing? Answers
will vary but should be between 20 and 20,000 Hz.
o. Once hearing is damaged, the only technological aids currently available are
hearing aids. Hearing aids aren't effective for everyone. Hair cells in the inner
ear must pick up the vibrations that the hearing aid sends and convert those
vibrations into nerve signals. So, you need to have at least some hair cells in the
inner ear for it to work. And, even if some hair cells remain, a hearing aid won't
completely restore normal hearing. Hearing aids work by placing an electronic
device on or near the ear. The hearing aid has four parts:




A microphone picks up sound from the environment and converts it into an
electrical signal, which it sends to the amplifier.
An amplifier increases the volume of the sound and sends it to the receiver.
A receiver/speaker changes the electrical signal back into sound and sends it
into the ear. Then those impulses are sent to the brain.
A battery provides power to the hearing aid.
Draw an expanded version of what you think the inside of a hearing aid would
look like, based on this information: answers will vary but should include all four
parts.
Conclusion: Which wave below has higher frequency? 1760
Amplitude? 1320
Would either one hurt your ears? Why? Cannot tell the amplitude.