| Category | Format | Size |
|---|---|---|
| People's Education Edition Physics for Grade 8, Volume 1 | pptx | 6 MB |
"Hazards and Control of Noise" PPT courseware on acoustic phenomena
Description
"Hazards and Control of Noise" PPT courseware on acoustic phenomena
1. Noise
1. 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. (Environmental protection perspective)
2. The sound produced when the sound emitter vibrates irregularly (physical perspective)
2. 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.
3. Noise control
Attenuate noise at the source, attenuate noise during propagation, and attenuate noise at the human ear.
Can you give some more examples?
summary
Try to answer the following three questions:
1. What kind of sound is noise?
2. What are the hazards of noise?
3． How to control noise?
Keywords: Acoustic phenomenon teaching courseware, noise hazards and control teaching courseware, People's Education Edition eighth grade physics PPT courseware download, eighth grade physics slide courseware download, acoustic phenomenon PPT courseware download, noise hazards and control PPT courseware download, .PPT format;
For more information about the "Hazards and Control of Acoustic Phenomenon Noise" PPT courseware, please click the "Hazards and Control of Acoustic Phenomenon Noise ppt" ppt tag.
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File Info
Update Time: 2024-06-24
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