"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 10

Description

"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 10

Import new lesson

The high-spirited march is exciting, and the melodious singing is mesmerizing.

Chinese People's Liberation Army March Violin Performance

The harsh sound of car horns and the roar of machines on the construction site make people feel nervous and irritable.

car horn sound

learning target

1. Understand the sources and hazards of noise.

2. Know how to control noise and enhance awareness of environmental protection.

Self-study guidance

Read the contents of P42-44 of the textbook, and draw the key contents with a pen, and think about the following questions at the same time:

1. How is noise generated?

2. What harm does noise do to people?

3. How can we effectively prevent or reduce noise?

Noise levels and hazards

1. Decibel (dB) is used as a unit to express the level of sound intensity.

2. Three boundaries for noise intensity:

>90dB will damage hearing;

>70dB, it will affect study and work;

>50dB, it will affect rest and sleep.

Summary

1. Source of noise

Noise is the sound emitted when the sound-emitting body vibrates irregularly;

Any sound that hinders people's normal rest, study, and work is noise.

2. Noise intensity levels and hazards

The unit of noise is: decibel, and the symbol is dB. The suitable intensity for learning is 30~40dB;

Harm: It can produce a series of effects psychologically, physiologically and physically.

3. Control noise

Prevent noise generation - control at the sound source (install a muffler at the sound source, prohibit honking, etc.)

Block the transmission of noise - control during the transmission process (sound insulation panels, planting trees and grass (absorbing noise), closing doors and windows, etc.)

Prevent noise from entering the ears - control at the human ear (wear earmuffs, cover ears with hands, etc.)

Traffic noise: horns, whistles, brakes, exhaust sounds, mechanical operation sounds, etc. from various vehicles. �

Industrial noise: noise from textile factories, printing factories, and machine workshops. �

Construction noise: road construction, building building, piling, etc.

Life noise: household noise, noise in entertainment venues, shops, and markets.

Self-study test (6 minutes)

1.Music sound: refers to _________ sound, which is emitted by the vibration of the sound-emitting body______.

2.Noise:

(1) From a physical perspective: noise is the sound emitted when the sound-emitting body vibrates ________;

(2) From the perspective of environmental protection: ① _________The sounds made by people normally resting, studying, and working are noise.

② Produce ______ sounds to the sounds that people want to hear.

3. Source of noise

There are four main sources: ________, ________, construction noise, and social life noise.

4. The unit of sound intensity level is _____, represented by the letter ____.

The sound that the human ear can just hear is ___ dB;

To ensure rest and sleep, the sound should not exceed ___ dB;

In order to ensure work and study, the sound cannot exceed ___ dB;

To protect hearing, the sound should not exceed ___ dB.

The ideal study and office environment is ___ to ___dB.

In-person training (20 minutes)

1. In physics, the sound produced when the sound-emitting body is called _________ is called noise. From the perspective of environmental protection, all sounds produced by _________ 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;

To ensure rest and sleep, the sound should not exceed _____ decibels

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

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. Noise during self-study classes

d. The sound of gongs and drums during the Peking Opera performance in the theater

e. The sound of electric drills when renovating a house

f.The sound of fireworks at night during the Lantern Festival

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Update Time: 2024-10-03

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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