"How do we hear sounds" Various sounds PPT courseware 2

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"How do we hear sounds" Various sounds PPT courseware 2

Review questions:

1. How is sound produced?

Sound is produced by the vibration of objects.

2. How does sound spread to distant places?

Sound travels through media.

3. What are the three types of media that transmit sound?

Solid, liquid, gas

4. In what form does sound propagate in the medium?

Sound travels in the form of sound waves in all media.

think

The world we live in is full of all kinds of colorful sounds. What organs in the human body do people rely on to hear sounds?

People listen to sounds with their ears, so how do the ears perceive sounds?

1. Structure of the human ear:

The human ear is divided into three parts: outer ear - middle ear - inner ear.

The middle ear and inner ear are inside the head and cannot be seen by us.

2. The process of people perceiving sound

Sound waves are similar to water waves. The vibration of the tuning fork causes the air around it to behave like water, causing waves to spread around.

Sound waves from the outside cause the eardrum to vibrate

This vibration passes through the ossicles and other tissues and is transmitted to the auditory nerve

The auditory nerve transmits signals to the brain, so that people hear sounds

Noise hazards

It hinders people's normal rest, study and work, and affects people's physical and mental health.

Some common ways to control noise:

Control noise generation: motorcycle mufflers and car horn honking are prohibited in the city.

Block the transmission of noise: sound insulation panels along urban roads and various trees along the roads.

Prevent noise from entering human ears: Factory-made anti-noise earmuffs.

discuss:

How should we protect our hearing in noisy environments?

put on earplugs

cover your ears

Get out of the noisy area

What can we do to reduce noise pollution?

Strictly control product quality and encourage the research, production and sale of less noisy means of transport and machines: Scientifically plan the location of highways and airports to keep them away from residential areas and buildings.

3. What is deafness?

1. During the entire process of sound transmission to the brain, if any part is blocked (such as damage to the eardrum, auditory ossicles, or auditory nerve), the person will lose hearing, leading to deafness.

2. Nervous deafness and non-nervous deafness.

(1) Deafness caused by damage to the auditory nerve is neurological deafness, which cannot be cured.

(2) Deafness caused by obstacles in the conduction of sound (such as damage to the tympanic membrane and auditory ossicles) is non-nervous deafness, which can be cured.

3. How should we treat people with hearing impairments?

Sympathy, care, understanding, help.

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"How Do We Hear Sounds" Various Sounds PPT Courseware 3:

"How Do We Hear Sounds" Various Sounds PPT Courseware 3 I am the best. I can listen carefully to the teacher's explanations and classmates' speeches. ( ) I can speak boldly and dare to express my opinions. ( ) I can actively participate in group discussions. ( ) I can guarantee that the class...

"How do we hear sounds" various sound PPT courseware:

"How We Hear Sounds" Various sound PPT courseware 1. The structure of the human ear The basic process of how people perceive sound The vibration of the tympanic membrane of sound from the outside spreads through the ossicles and other tissues The auditory nerve transmits signals The brain produces an introduction to common sense of hearing :just..

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Update Time: 2024-10-02

This template belongs to science courseware People's Education Press Fourth Grade Science Volume 2 industry PPT template

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