"Let Sound Serve Humanity" Sound and Environment PPT Courseware

Description

"Let Sound Serve Humanity" Sound and Environment PPT Courseware

teaching objectives

1. Understand the application of sound knowledge in music and architecture;

2. Know the sources of noise and the methods and ways to control and reduce noise.

3. The application of sound in modern science and technology, cultivating the awareness of sustainable development and the sense of mission of serving scientific knowledge to mankind.

Detection Preview Exchange Display

1. Test preview a. Briefly introduce the relationship between sound and music; briefly introduce the relationship between sound and architecture; briefly introduce the binaural effect and its application.

2. Detection b. What is noise? What are the hazards? How to control noise? Communicate three ways to control noise in daily life applications.

sound and music

Music is a flowing art. Musicians use different tones, loudness, accompanying sounds, harmony, etc. to form different melodies. Some are high-pitched and majestic, some are low-pitched and lyrical, some are brisk and smooth, and some are gentle and lingering...

①Irregular vibration from a physical perspective

②Environmental protection perspective

All sounds that hinder people's normal rest, study and work, as well as sounds that interfere with the sounds people want to hear, are noises.

Group discussion one:

Could you please tell me what noises are around you or around you?

Control and reduce annoying noise

To control and reduce noise, measures are mainly taken in three aspects: sound attenuation, sound absorption and sound insulation.

1. Silence

Adding a silencer to the car's exhaust pipe can reduce exhaust noise

2. Sound absorption

3. Sound insulation

[Example 1] Use a tape recorder to record a man's voice. If we play the recorded voice faster than the recording speed, we find that the voice of an adult man is similar to that of a woman. Why is this?

[Example 2] In order to reduce noise, the following measures are not feasible: ( )

A. Replace noisy machines with quiet ones

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

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

D． Turn off all sound sources

[Example 3] Regarding the application of sound, which of the following statements is incorrect ( )

A. Traditional Chinese medicine diagnoses diseases through the four channels of "looking, smelling, asking, and feeling", among which "smell" uses sound to obtain information about all aspects of the body.

B. Sound waves can transfer energy, so sound waves can be used to clean fine machinery.

C. The teacher is lecturing in the classroom, and the echo plays a role in enhancing the original sound.

D. Sound plays an important role in industrial and agricultural production, medical treatment, military, etc. and is not harmful.

Class exercises

1 The following are some objects that are vibrating:

A: The arms move up and down 2 times per second;

B: The bat’s mouth emits vibrations with a frequency of 100000Hz;

C: A tuning fork struck with a small hammer emits a sound with a frequency of 256Hz.

Which of the following statements about the above objects are correct ( )

A. A, B, and C are all sound sources, and the sounds they make can be heard by human ears.

B. C is the sound source, and the sound it makes can be heard by human ears; A and B are not the sound sources.

C. A, B, and C are all sound sources, and human ears can only hear the sound produced by C.

D. None of the above statements are correct

2 Among the following methods of reducing noise, the one that reduces noise at the sound source is ()

A. The walls of the theater are made of sound-absorbing materials

B. Staff wearing helmets with earmuffs next to the aircraft

C. Honking is prohibited on certain sections of the city

D. Some sections on both sides of the elevated road are equipped with soundproof board walls

The production and spread of sound

Variation. When tuning fork A is struck, the observed phenomenon or related analysis error is ( )

A. The table tennis ball bounces away, indicating that the vibration is transmitted from A to B through the air.

B. The role of table tennis is to amplify experimental phenomena

C. Sound has energy

D. You can also see table tennis balls being bounced on the moon

Operation:

Classwork: p44 pages 1, 2, 3, 4, 5, 6, 7.

Tutorial (preview): a. What is a light source? b. For example, light propagates along a straight line in the same uniform material. Applications.

c. What is the speed of light in vacuum? What kind of light does white light consist of? Understanding of light dispersion, three primary colors, three primary colors, monochromatic light, and complex color light.

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For more information about the PPT courseware "Sound and Environment Let Sound Serve Humanity", please click the Sound and Environment ppt Let Sound Serve Humanity ppt tag.

"Let Sound Serve Humanity" Sound and Environment PPT Courseware 2:

"Let Sound Serve Humanity" Sound and Environment PPT Courseware 2 Learning Objectives 1. Understand the application of sound knowledge in music and architecture, understand the application of ultrasound and infrasound in life and modern technology 2. Know the sources and control of noise , the core of measures to reduce noise...

File Info

Update Time: 2024-09-01

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume one industry PPT template

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