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8L4 – Can Sound Be Dangerous?

8L4 – Can Sound Be Dangerous?. Can Sound Be Dangerous?. The Aim of this lesson is to: Be able to compare loudness. Know that loud sounds can damage hearing. Know how we can protect our hearing. Recap - The Ear. Recap - The Ear and Sound Waves. Hearing Range.

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8L4 – Can Sound Be Dangerous?

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  1. 8L4 – Can Sound Be Dangerous?

  2. Can Sound Be Dangerous? The Aim of this lesson is to: • Be able to compare loudness. • Know that loud sounds can damage hearing. • Know how we can protect our hearing.

  3. Recap - The Ear

  4. Recap - The Ear and Sound Waves

  5. Hearing Range Humans can only hear sounds of certain frequencies. The range of frequencies a person can hear is called their hearing range. What is the hearing rangeof a healthy young person? 20 Hz to 20,000 Hz

  6. Hearing Ranges and Hearing Loss Does everyone have the same hearing range? We all have slightly different hearing ranges. People lose the ability to hear sounds of high frequency as they get older. Almost 1 in 5 people suffer some sort of hearing loss. Temporaryhearing loss may be caused by ear infections and colds, after which hearing recovers. Permanenthearing loss and deafness can be present at birth or occur if the ear is damaged or diseased.

  7. personal stereo aircraft overhead quiet countryside loud bell circular saw at 2m can just be heard pin being dropped Measuring Loudness – Decibel Scale decibels 160 140 120 100 80 60 40 20 0

  8. The Decibel Scale

  9. Noise and Its Effects A noise is any unwanted sound. What one person considers noise another person might not. Can you name any examples? Noise can cause hearing problems. List three effects of noise. headaches nausea deafness List three ways of reducing the effects of loud noise. ear protectors double glazing putting noisy machinery in insulated rooms

  10. Sound Insulation Sounds travel best through solids, i.e. materials with few spaces between particles, such as iron. Sounds don’t travel well through materials with lots of air trapped inside them, such as sponge.

  11. Sound Insulation Sometimes we’d rather not hear certain sounds! Sound insulators can be used to block out or reduce sounds

  12. Any Questions ?

  13. Summary Questions • How do we compare loudness of sounds? • Can Sound Be Dangerous? • How can loud sounds can damage hearing? • How can we protect our hearing?

  14. Prep Enter the following in your personal Prep diaries: Lonsdale p65 and p66 To be completed by:

  15. Next Lesson

  16. Any Questions ?

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