"Hazards and Prevention of Noise" PPT courseware download

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"Hazards and Prevention of Noise" PPT courseware download

Part One: Sources of Noise

1. Noise from a physical perspective:

It is the sound produced when the sound-emitting body vibrates irregularly.

2. Noise from the perspective of environmental protection:

All sounds that hinder people's work and study, affect people's lives, and interfere with people's hearing are noises.

3. Source of noise

Traffic noise: engines, whistles, brakes;

Construction noise: the sound of mixers, pile drivers, cutting machines, etc.;

Noise in the factory: machines vibrate and make noise, and machines make noise when cutting, rubbing, forging, etc.;

Noise from social life: music from entertainment venues, shouts and hawking from shops and markets.

Noise hazards and prevention PPT, Part 2: Noise levels and hazards

1. The level of noise is expressed in decibels

To protect hearing, the sound should not exceed 90dB

In order to ensure work and study, the sound should not exceed 70dB

In order to ensure rest and sleep, the sound should not exceed 50dB

2. The harm of noise

Seriously affect people's work, life and physical and mental health

Working in a noisy environment for a long time can cause hearing loss or even deafness, and can also cause other diseases (headaches, high blood pressure, etc.)

PPT on the harm and prevention of noise, part three: practice

1. The weakest sound that a person can hear is ____dB;

2. The ideal quiet environment is ____ dB;

3. The sound intensity that interferes with conversations and affects work efficiency is ____ dB;

4. The sound intensity that will seriously affect hearing is ____ dB or above;

5. The sound intensity that can cause hearing loss in both ears is ____dB.

6. In order to protect hearing, the sound should not exceed ____dB;

7. In order to ensure work and study, the sound should not exceed ____dB;

8. In order to ensure rest and sleep, the sound should not exceed ____dB.

PPT on the harm and prevention of noise, Part 4: Controlling noise

The three stages of sound from production to hearing

Sound source vibrates to produce sound

prevent noise

at the sound source

Propagation through air and other media

Block the spread of noise

in the process of spreading

Received by the human ear (vibrations of the eardrum)

Prevent noise from entering your ears

in human ear

PPT on the harm and prevention of noise, Part 5: Class summary:

1. Definition of noise: ①Physics perspective ②Environmental protection perspective

2. Noise intensity level and hazards

0dB 30~40dB 50dB 70dB 90dB 150dB

3. Control noise from three aspects

①Prevent noise generation - at the sound source:

②Block noise propagation - during the propagation process:

③Prevent noise from entering the ears - at the human ear:

PPT on the harm and prevention of noise, part six: compliance testing

1. In physics, the sound produced when the sound-emitting body is called ____________ is called noise. From the perspective of environmental protection, all ___________ sounds are noise.

2. People use _______ to classify sound levels. In order to protect hearing, the sound should not exceed _______ decibels; in order to ensure work and study, the sound should not exceed _______ decibels; in order to ensure rest and sleep, the sound should not exceed ______ _decibel

3. Planting trees along the roadside and near residences can not only purify the air, but also play a _______ role.

4. The washing machine makes a lot of noise because it is not placed properly. You should ()

A. Buy a new one B. Close the doors and windows

C. Unplug the washing machine D. Place the clothes evenly again

5. Which of the following sounds is noise is _________.

a. The sound of reading aloud during morning reading b. The sound of running car engines in the city

c. The noise during the self-study class d. The sound of gongs and drums during the Peking Opera performance in the theater

e. The sound of electric drills when renovating the house f. The sound of fireworks at the Lantern Festival night

Keywords: Qingdao edition fifth grade science PPT courseware free download, noise hazards and prevention PPT download, .PPT format;

For more information about the "Hazards and Prevention of Noise" PPT courseware, please click the "Hazards and Prevention of Noise" ppt tag.

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"The Harm and Prevention of Noise" PPT download Part 1: Noise Do you know? What is noise? Noise is noise. It is a type of sound that causes people to be irritated or whose volume is too strong and endangers human health. From the perspective of environmental protection, anything that affects people's normal...

"Hazards and Prevention of Noise" PPT courseware:

"The Harm and Prevention of Noise" PPT courseware Explore: The sources of noise Explore: How do people control and eliminate noise pollution? Methods to prevent and control noise: 1. Control noise sources 2. Block noise transmission 3. Attenuate noise at the human ear Thinking: What are the noises around us? ..

"The Harm and Prevention of Noise" PPT:

"The Hazards and Prevention of Noise" PPT Part One: Content Introduction 1. Noise In physics, the sound emitted when the sound-emitting body vibrates irregularly is called noise. From an environmental protection point of view, any sound that interferes with people's normal rest, study and work, and is harmful to people...

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Update Time: 2024-09-11

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template

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