Sound is a form of energy that is transmitted by pressure variation that the human ear can detect. Sound can also travel through other media, such as water or steel. Frequency and intensity are the two features of sound

WHAT IS SOUND?

Noise is any annoying, disturbing or unwanted sound, that disturbs people or makes it difficult to hear wanted sounds. Depending on the quantity of dB it can hurt in different ways

THE MEASUREMENT OF THE SOUND PRESSURE DOESN'T HAVE A LINEAR EQUIVALENCE RELATION.IT IS A LOGARITHMIC FUNCTION

EFFECTS OF NOISE ON HEALTH The decibel (dB) table compares some common sounds and shows how they rank

in potential harm to hearing. 70 dB is the point at which noise begins to harm hearing. To the ear, each 10 dB increase seems twice as loud.

Sound Levels and Human Response Common sounds Noise Level [dB] Effect

Rocket launching pad (no ear protection) 180 Irreversible hearing loss

Carrier deck jet operation (25 m). 140 Painfully loud

Thunderclap 130

Jet takeoff (60 m) 120 Maximum vocal effort

Rock concert 110 Extremely loud

Firecrackers 100 Very loud

Heavy truck (15 m). City traffic 90 Very annoying Hearing damage (8h)

Alarm clock (0,7 m). Hair dryer 80 Annoying

Noisy restaurant. Business office 70 Telephone use difficult

Conversational speech 60 Intrusive

Light auto traffic (30 m) 50 Quiet

Living-room, bedroom. Quiet office 40

Library. Soft whisper (5 m) 30 Very quiet

Broadcasting studio 20

10 Just audible

0 Hearing begins

Cardio-respiratory disfunction

Variations in the endocrine system

Irritate people

Reduce working efficiency

Disturb people

Hearing loss

Place Time Decibels(dB)

Hall Entry time

(8:20) 72

Corridor Between lesson 78-82

Normal Class Maths lesson

(11:35) 74

Normal Class English lesson

(14:00) 80

Playground Break (11:15) 90-95

Library Break(11:15) 68

Normal Class Break(11:15) 65

Hall Departure time 95

We can observe that in some moments of the day there is too much noise (78-79 dB), so it can be harmful. That happens because students are in corridors speaking loudly. Nevertheless, in other places there is more silence, maybe because some steps have already been taken. (Example: library)

When it’s yellow or green: Nothing will happen.

When it’s red: Students must lower their voice

Awareness posters: •Through a competition students make a poster to raise awareness of the importance of keeping silence • The winner will get between 50€ and 70€ for school supplies, books…