Here’s the word. What is the question?

• NOISE• DECIBEL• SOUND• FREQUENCY• PITCH• HEARING• EAR

Hearing

Learning Objectives

2. Understand what we can do to protect ourselves from hearing damage

3. Recognise what precautions employers need to take to protect their workers from hearing damage

1. Understand the possible damages to our ears

• http://www.youtube.com/watch?v=3Wj8MVnRF6c

What is Noise?

• A noise is any unwanted sound.

• What you might not consider noise, loud music for example, other people might, so be aware.

Loudness is measured in decibels dB

Your Hearing is very delicate. It contains thin membranes and tiny bones that can

become easily damaged.

What ways do you think this

could happen?

Hearing

Learning Objectives

2. Understand what we can do to protect ourselves from hearing damage

3. Recognise what precautions employers need to take to protect their workers from hearing damage

1. Understand the possible damages to our ears

What is this?

Why is it not good for this?

The vuvezela is a horn that is popular at football matches in Africa. It creates a loud noise, but how loud?Loudness is measured in decibels (dB)

faint moderate loud very loud painful

0 20 40 60 80 100 120 140 160dB

whisper

alarm clock

lawnmower

chainsaw

conversation

jet engine

right next to the speakers at a rock concert

Where do you think those go on the decibel scale above?

a vuvezela

Sound : How loud are sounds?

150

140

120

100

80

60

40

20

10

0

Permanent ear damage

Can just be heard

Aircraft overhead Personal stereo

A circular saw at 2m

Loud bell

Pin being dropped

Quiet countryside

• http://www.youtube.com/watch?v=kLSYq5kau_w

Why are some sounds dangerous?

• In our inner ear, there are nerve hair cells which are moved by sound vibrations.

• These nerves generate tiny electric signals which are sent to the brain.

• If the sound is too intense the hair can be damaged and do not produce electrical signals and you do not hear the sound

What can we do to protect

our ears??

What can we do to protect

our ears??

Task

Ear protection

• Don’t stay too long in noisy places

• Wear ear muffs/ear plugs if in a noisy place (like using power tools)

• Keep the volume of your music turned down

Copy this paragraph into your books and fill in the missing words.

• Noise is unwanted sound (usually …………... sounds). Loud sounds can damage the …… …….. The loudness or …………………. Of sounds is measured in …………… (dB for short).

Noise and its effects

1) What one person considers noise another person might not. Can you name any examples?

In groups list 3 example.

2) Noise can cause hearing problems. List 3 effects of noise

3) Write in your book. How could you reduce the damage to your ears if:

• a) You lived next to a busy motorway?

• b) You use a pneumatic drill at work?

• c) You like listening to music on an ipod?

Task

• In pairs write down a list of things employers can do to prevent hearing loss of workers in loud places.

Noise in the workplace

• Employers need to help their workers by:

1) Reducing the amount of time they are exposed to loud noise.2) Considering other ways of working to reduce their exposures to loud noise. 3) Increase distance between workers and noisy operations.4) Providing hearing protection.

Extend ourselves! Level 8

• What are the benefits to employers of reducing noise levels in the workplace?

Question the answer

• Write the question to each answer given on your mini whiteboard

Question the answer

• Decibels

Question the answer

• noise

Question the answer

• Ear damage

Question the answer

• Ear protection

Question the answer