1. 6th Grade Objective 1.6

2. Objective 1.6
Summarize protective measures for ears and hearing.

3. The Ear

4. How do You Hear? How does sound get into your brain? OR

5. Noise Levels by Daily Activity
Source of Noise
Sound level (dB)
Firearms
140 to 170
Jet engines
140
Rock concerts
90 to 130
Amplified car sound systems
140 (at full volume)
Portable stereos (e.g., MP3 players)
115 (at full volume)
Power mowers
105
Subway trains
100
Video arcades
Electric razors 85
Crowded school buses
School recesses or assemblies

6. Noise Pollution What Is Noise Pollution?
sounds that cause harm/loss to one’s hearing
How Can You Reduce Noise Pollution?

7. Hearing Loss
Hearing loss can result from damage to structures or nerve in the inner ear that respond to sound.
This type of hearing loss, termed “noise-induced hearing loss,” is usually caused by exposure to very loud sounds and cannot be medically or surgically corrected.

8. Hearing Loss
Sound intensity is measured in decibels with a sound level meter.
Noise-induced hearing loss can result from a one-time exposure to a very loud sound, blast, impulse, or by listening to loud sounds over an extended period.
The louder the sound, the shorter the time period before hearing damage occurs.

9. Hearing Loss
Because the damage from noise exposure is usually slow, a person might not notice or might ignore signs of hearing loss until more symptoms of permanent hearing loss become evident.

10. Signs of Hearing Loss
Noticeable signs of hearing loss can include the following:
Muffled or distorted hearing
Difficulty hearing sounds such alarm clocks, watch alarms, telephones, or doorbells
Difficulty understanding speech during telephone conversations or while participating in group conversations
Pain or ringing in the ears after exposure to very loud sounds

11. Book Work Page 145 #’s 1-4 Page 147 #’s 1-5 Page 151 #’s 1-7