"Noise and Environmental Protection" Acoustic Phenomenon PPT Courseware 4

"Noise and Environmental Protection" Acoustic Phenomenon PPT Courseware 4

Noise hazards and control

Situation import:

Please think of the sounds in the following life phenomena:

1.Music played in the concert hall

2. The sound of car engines next to the road

Which sound sounds good? Why?

Self-study

Contents on pages 42-44 of the self-study textbook and complete the self-study outline.

1. Read the first part of the textbook and summarize the concept of noise from the perspective of physics and environmental protection.

(1) From a physical point of view, the sound emitted by the sound emitting body is called noise.

(2) From the perspective of the protection of the Ministry of Environment, all _______________ sounds and sounds that _______________ to people are noise.

(3) List as many common noises in life as possible.

Group discussion: Is there any noise in and around the classroom? If there is noise, where does it come from?

2. Read the second part of the textbook carefully and complete the following questions by comparing the tables in the small information.

(1) Remember that the noise level unit is ______. In order to protect hearing, the sound should not exceed _____dB; in order to protect our work and study, the sound should not exceed ______dB; in order to ensure rest and sleep, the sound should not exceed _____dB.

(2) Give examples of the harm that noise does to people. (Think on your own first, then discuss and present in the group)

2. What are the hazards of noise?

1. Can cause tinnitus, earache and damage hearing.

2. It makes people upset and reduces work efficiency.

3. Damage the cardiovascular system and cause high blood pressure and heart disease.

4. It can cause nervous system dysfunction, headache, dizziness, insomnia, memory loss, and moodiness.

5. Interfering with rest and sleep. etc.

3. Control noise

summary:

(1) There are three stages from sound generation to hearing: _______________, _____________, and ______________.

(2) Three aspects of noise control: _____________, ______________, ______________.

group discussion

How to control noise in the classroom?

Four reflections

1. What did you gain from this class?

1. Sources and classification of noise

Definition from a physical perspective

Environmental protection perspective definition

2. Noise intensity levels and hazards

3. Control noise

prevent noise

block sound transmission

Prevent noise from entering your ears

2. How has learning this lesson inspired your past behavior? What will you do in the future?

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. Which of the following statements about noise is wrong ( )

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.

3. Which of the following are noises ( )

A. During class, beautiful singing came from the big speakers in the school.

B. The teacher’s voice during class.

C. The symphony played in the concert hall.

D. The sound of wind and rain imitated by a ventriloquist on the stage.

4. 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

STS Did you know?

In winter, after a heavy snowfall, people often feel completely silent. Do you know why?

The snow that has just fallen is fresh and fluffy. There are many small pores on its surface. When external sounds are introduced into these small pores, they will be reflected. Since the pores are often large inside and small in diameter, only a small part of the sound can be heard. Reflected from the entrance, most of it was sucked away, resulting in a scene of complete silence.

Sound is absorbed by the snow as it travels.

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