"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 9

Description

"Hazards and Control of Noise" Acoustic Phenomenon PPT Courseware 9

1. Noise and its sources

Read the text and discuss:

�1�From a physical perspective, what is noise?

�2�What is noise from the perspective of environmental protection? Why is music sometimes also noise?

�3�What are the main sources of noise around us?

Sources of noise:

Industrial noise: the sound of engines running, electric saws, machine tools, electric drills, construction site blasting, etc.

Traffic noise: the chirping of cars and motorcycles, the friction of wheels against the road, loud noises such as trains and airplanes.

Resident noise: the working sound of household appliances, people talking, crying and laughing, etc.

Three ways to control noise

1. Prevent noise generation

2. Block the spread of noise

3. Prevent noise from entering the ears

practise:

1. Which of the following statements about noise is incorrect ( )

A. The pleasant music may be noise;

B. Noise is emitted when the machine vibrates during operation;

C. Noise harms people’s physical and mental health;

D. Sounds that interfere with the sounds people want to hear are noises.

2. When washing clothes in a washing machine, if the clothes are not put away properly, it will cause the washing machine to vibrate violently and make noise. What should be done in this case ( )

A. Wear earplugs or cover your ears to reduce noise in human ears;

B. Close the door to reduce the noise during transmission;

C. Lay your clothes flat to reduce the noise at the source;

D. Stop the washing machine and wash by hand to reduce the noise at the source;

3. The four major pollutions in today’s society are ( )( )( )( ).

4. In order to protect hearing, the noise should be controlled not to exceed ( ) dB. In order to ensure work and study, the noise should be controlled not to exceed ( ) dB. In order to ensure rest and sleep, the noise should be controlled not to exceed ( ) dB.

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Update Time: 2024-10-26

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

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