"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 3

Description

"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 3

teaching objectives

1.Knowledge and skills�

Understand the sources and hazards of noise. �

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

2. Process and methods�

Learn about noise prevention and control ideas through experience and observation.

3. Emotional attitudes and values�

Through learning, we can cultivate environmental awareness to love and protect the "global village" on which we live.

1. Source of noise

from a physical point of view

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

From the perspective of environmental protection

Any sound that hinders people's normal rest, study and work, as well as any sound that interferes with the sounds people want to hear.

(2) Four major sources of noise

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.

2. Noise intensity levels and hazards

Sound intensity level

Expressed in decibels (dB).

To protect hearing, the sound cannot exceed 90dB;

In order to ensure work and study, the sound cannot exceed 70dB;

To ensure rest and sleep, the sound should not exceed 50dB.

Noise levels and hazards:

30dB-40dB: ideal quiet environment;

70dB: Interfering with conversations and work;

90dB: Long-term tolerance will seriously affect hearing;

150dB: tympanic membrane rupture, loss of hearing.

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

Control at the sound source;

control during propagation;

Control at the human ear.

Consolidation exercises

1. In order to ensure normal work and study, the ambient sound should be controlled not to exceed ( )

A. 50dB

B. 70dB

C. 90dB

D. 110dB

2. If there is construction going on near your home, interfering with your study and rest, the following measures will be ineffective ( )

A. Close the doors and windows quickly B. Plug your ears with cotton

C. Open the doors and windows D. Hang the cotton blanket on the window

3. In order to reduce the noise, the following measures are not feasible ( )

A. Replace noisy machines with quiet ones

B. Set up barriers or plant trees between roads and residences

C. Wear anti-noise earmuffs and put a ball of cotton in your ears

D. Turn off all sound sources

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Update Time: 2024-10-02

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

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