"The Utilization of Sound" Sound Phenomenon PPT Courseware 5

Description

"The Utilization of Sound" Sound Phenomenon PPT Courseware 5

Review questions

1. What is noise from a physical perspective?

From a physical point of view, noise refers to the sound emitted when the sound-emitting body vibrates irregularly.

2. What is noise from the perspective of environmental protection?

From the perspective of environmental protection: All sounds that hinder people's normal rest, study and work, as well as sounds that interfere with the sounds people want to listen to, are noises.

3. What are the sources of noise in life?

Traffic and transportation noise, industrial noise, construction noise, social life noise

4. What harm does noise do to us?

5. The three ways of noise control are:

1. Attenuate at the sound source

2. Weakened during the propagation process

3. Weakened at the human ear

1. Sound and information

What are some examples of obtaining information through sound?

1. Obtain information from sound

(1) Doctors use stethoscopes to diagnose diseases; the "smell" in "look, smell, ask, and feel" is auscultation and percussion.

(2) The car mechanic listens to the sound of the car engine to determine the fault;

(3) Railway workers will find loose bolts from the abnormal sound when they hit the rails with a hammer.

2. Echolocation: Determine the location and distance of the target based on the direction and time of the arrival of the echo.

(1) Ancient sailors sailing in the fog judged the distance of the cliff by the echo of the horn

(2) Bats rely on ultrasonic waves to detect obstacles in flight and find insects (foraging)

(3) Use sonar to detect ocean depth and fish

(4) B-ultrasound” (uses ultrasound to obtain information inside the human body)

2. Sound and energy

Sound travels outward in the form of waves

The energy of the object's vibration is transmitted through the medium in the form of sound waves

2. Application:

(1) Use ultrasonic waves to clean fine machinery (such as watches). Ultrasonic waves propagate forward in alternating density and density in the cleaning liquid, stretching and squeezing the liquid, causing tens of thousands of tiny bubbles to be generated in the liquid. These bubbles generate quickly and close quickly, forming an instantaneous high pressure that exceeds 1,000 times atmospheric pressure. The continuous high pressure continuously impacts the surface of the object, causing the dirt on the surface and gaps of the object to quickly peel off, thereby achieving the purpose of purifying the surface of the object. Ultrasonic cleaning can achieve ideal results.

(2) Surgeons can use ultrasound to remove stones from the human body

(3) Ultrasonic washing machines do not require the use of washing powder and use ultrasonic waves and electrolyzed water to wash

Class exercises

1. When railway workers hit the rails with a hammer, they will find loose bolts from the abnormal sound, which shows that _______ can be obtained through sound.

2. Bats can use echo to determine _______. This method is called _______. Scientists used this principle to invent _______.

3. Place two identical tuning forks side by side (without contact), with the ping pong ball leaning against tuning fork B. When tuning fork A is struck, you will find that the ping pong ball _______, which illustrates _______.

4. The following are not the use of acoustic information ( )

A. The rumble of thunder in the distance indicates a possible heavy rain.

B. Doctors use B-ultrasound to observe people’s physical condition

C. Surgeons use ultrasound to remove stones from the human body

D. When choosing a porcelain bowl, experienced people always knock it to distinguish the sound quality.

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Update Time: 2024-11-13

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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