"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 5

Description

"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 5

learning target

1. Understand the source of noise.

2. Understand the level of noise and the hazards of noise.

3. Know how to prevent noise and enhance awareness of environmental protection.

Self-study exploration (1) Sources of noise

Read the textbook and answer the following questions:

1. What is the meaning of noise?

Noise from a physical perspective: it is the sound emitted when the sound-emitting body vibrates irregularly.

Noise from the perspective of environmental protection: Any sound that hinders people's work and study, affects people's lives, and interferes with people's hearing is noise.

2. Based on the examples around you, where does the noise in discussions at the same table come from?

Source of noise

Traffic noise: engine sound, whistle, brake sound;

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

Industrial noise: vibration and sound produced by machine operation, sound produced by machines cutting, rubbing, forging, etc.;

Resident noise: music from entertainment venues, shouts and hawking from shops and markets.

Self-study inquiry (2): Levels and hazards of noise

Read the text and answer:

1. How are noise levels classified?

2. What are the hazards caused by different noise levels to people?

3. Carefully read the small information on P46 - Human Feelings of Sounds of Different Intensities.

Invisible killer - the harm of noise

Psychological effects: It makes people irritable, lacks concentration, hinders sleep and rest, and affects work efficiency.

Physiological effects: headache, indigestion, blurred vision, deafness, etc., or even confusion, shock or death in severe cases.

Physical effects: High-intensity noise can damage buildings.

Exercise 3

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

2. The washing machine makes a loud noise because the clothes are not put away 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

3. Among the following measures to reduce noise, which ones are reduced during the propagation process ( )

A. Noisy work on construction sites must be done within a time limit

B. Planting grass and trees in urban areas

C. Wear earplugs to prevent noise

D. Cars are prohibited from honking in urban areas

4. The following measures to reduce noise belong to attenuation at the sound source ( ) (multiple choices)

A. Cars are prohibited from honking in urban areas

B. Plant trees and grass on both sides of the street

C. Spinners wear anti-noise earplugs

D. Noisy work at construction sites must be done within a time limit

What did you learn?

1. Sources of noise: traffic noise, industrial noise, residential noise

2. Noise level decibels, hazards

3. Three ways to control noise:

Control at the sound source. Specific measures to prevent noise generation.

Control specific measures to block the spread of noise during the propagation process

Control at the human ear Specific measures to prevent noise from entering the ear

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Update Time: 2024-10-03

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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