"Protecting Our Hearing" Sound PPT Courseware 5

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"Protecting Our Hearing" Sound PPT Courseware 5

What is noise?

Describe the characteristics of noise and how we experience it.

Noise is noise. It is a type of sound that is too high or too strong to cause irritability and endanger human health. Usually refers to those unpleasant, annoying sounds. Noise pollution mainly comes from transportation, vehicle horns, industrial noise, construction, concert halls, loudspeakers, morning markets and people talking loudly.

Information 1 A survey found that the hearing of a 70-year-old man in rural Africa is as good as that of a 20-year-old young man in a big city in the United States. The reason is that the elderly in rural Africa have spent their entire lives in the natural environment with almost no noise pollution.

Information 2 60-70 decibels: noisy, damaging to the nerves;

70-90 decibels: Very noisy, nerve cells are damaged;

90-100 decibels: Intensified noise and hearing loss;

100-120 decibels: unbearable, and will cause temporary deafness if left for one minute;

120-190 decibels: extreme deafness or total deafness;

190 decibels and above: Causes death.

Noise prevention and control

Attenuation at the sound-producing object

For example, install fixed bases on large machines and add mufflers to the suction and exhaust pipes. Transform into a machine with less vibration.

weaken during the propagation process

For example: build factories and workshops with serious noise pollution in the suburbs away from the urban area; turn the doors and windows of the factory buildings where the noise comes from away from residential areas and schools, and install door curtains; set up barriers or plant trees on the streets and between residences.

Attenuated at the human ear

You can wear ear protection, such as earmuffs, ear plugs, or a small ball of cotton inserted into the ear hole.

Hearing protection common sense

When washing your hair and swimming, avoid sewage entering the ears, which may cause ear inflammation.

When a foreign object enters the ear canal, do not dig it out yourself to avoid damaging the eardrum. Seek medical attention as soon as possible.

Avoid listening to earphone radios or tape recorders for long periods of time, and the volume should be set to moderate or lower.

In noisy environments, cover your ears with your hands or wear ear protection.

Only take medications under the guidance of a doctor, as overdose of some medications may cause tinnitus or hearing loss.

When you notice ear discomfort, such as pain or pus discharge, you should seek medical advice as soon as possible.

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Update Time: 2024-09-09

This template belongs to science courseware Fourth Grade Science Volume 1, Textbook Edition industry PPT template

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