"How to Hear Sound" PPT

Description

"How to Hear Sound" PPT

Part One: Review and Review

1. Production of sound: vibration of objects

2. Sound propagation needs: medium

What objects can act as media?

Solid, liquid, gas

3. Can sound be transmitted through a vacuum?

cannot

4. The speed of sound in the air at 15 degrees:

340 meters/second

How to hear sound PPT, Part 2: The structure of the ear

External ear, auricle, external auditory canal

middle ear tympanic membrane ossicles tympanic cavity

inner ear semicircular canals vestibule cochlea

1. Functions of each part of the ear:

external ear

Auricle----------collects sound waves

External auditory canal----------sound wave channel

middle ear

Tympanic membrane ----------vibration

Tympanic cavity ----------- communicates with the Eustachian tube

Ossicles----------amplify and transmit sound waves

Eustachian tube---------regulates the air pressure inside and outside the tympanic membrane

inner ear

Semicircular canals and vestibule-----there are position sense receptors in them to maintain the balance of the body

The cochlea ----------contains auditory receptors.

How to hear sounds PPT, Part 3: Think about it, do it

1. Place the vibrating tuning fork near your ear and listen to the sound of the tuning fork

2. Block your ears with your hands and listen to the sound of the tuning fork.

3. Block your ears with your hands and place the tail of the vibrating tuning fork against your forehead, bones behind the ears, and teeth. Can you hear the sound of the tuning fork?

Discussion: How do people hear sounds in these situations?

bone sound transmission

Sound can be transmitted through the skull and jaw to the auditory nerve, causing hearing.

Scientists call this sound conduction method bone conduction.

For example: After Beethoven became deaf, he created music through bone conduction.

How to hear sounds PPT, Part 4: General knowledge about hearing protection

When washing your hair and swimming, avoid sewage entering the ears, which may cause ear inflammation.

Do not "wake up" your nose vigorously.

When a foreign object enters the ear canal, do not dig it out yourself to avoid damaging the eardrum. Seek medical attention as soon as possible.

Avoid listening to earphone radios or tape recorders for long periods of time, and the volume should be adjusted to moderate or below.

In noisy environments, cover your ears with your hands or wear ear protection.

Only take medications under the guidance of a doctor, as overdose of some medications may cause tinnitus or hearing loss.

When you notice ear discomfort, such as pain or pus discharge, you should seek medical advice as soon as possible.

How to hear sounds PPT, Part 5: Practice

1. Among the structures of the ear, the part that can receive sound waves and convert them into vibrations is ( )

A. Auricle B. Tympanic membrane

C. Ossicles D. Ear canal

2. Human hearing arises from ( )

A. Auditory receptors B. Cochlea

C. Auditory center D. Tympanic membrane

3. Which of the following statements about the functions of various parts of the ear is incorrect ( )

A. The function of the auricle is to collect sound waves in the air

B. The vibration of the tympanic membrane is to generate sound waves, causing the sound waves to hit the ossicles in the tympanum to vibrate.

C. The vibration of the ossicles amplifies the sound and then transmits it to the cochlea.

D. Sound waves are transmitted into the inner ear, causing the fluid in the cochlea to vibrate. The sensory cells transmit this information along the nerves to the brain.

Keywords: Qingdao version fifth grade science PPT courseware free download, how to hear the sound PPT download, .PPT format;

For more information about the "How to Hear Sound" PPT courseware, please click on the "How to Hear Sound" ppt tag.

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Update Time: 2024-09-13

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template

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