"The Utilization of Sound" Sound Phenomenon PPT Download

"The Utilization of Sound" Sound Phenomenon PPT Download

The first part: sorting out new knowledge

A sound and information

1. Nature: Elephants can communicate using infrasound waves, which means that sound can transmit ______.

2.Application

(1) Information can be transmitted audibly. For example, getting the information that it is going to rain from the rumble of thunder.

(2) Ultrasonic waves transmit information. For example, doctors use B-ultrasound to understand the development of the fetus.

(3) Infrasound waves transmit information. For example, technicians can determine the location and intensity of earthquakes and typhoons by monitoring infrasound waves.

(4) Echolocation: Sonar is made based on the principle of echolocation. People can use sonar to determine the depth of the ocean. The calculation formula is ____________. The working process is: the transmitter emits ultrasonic waves, and the sonar detects the reflected echo, so that the depth of the ocean can be calculated.

2. Sound and energy

1. Properties: As shown in Figure 2-3-1, knock one end of the rubber membrane with your hand and the flame tilts, indicating that sound can be transmitted ______.

[Dial]Moving objects have energy, and the vibration of the sound source can cause surrounding objects to vibrate, indicating that sound can transfer energy.

2. Application: Use ______ vibration to remove stones from the human body, clean watches and other fine machinery, etc.

Utilization of sound PPT, part 2: application examples

Type 1 Sound energy transmits information

Example 1: All objects that make sounds are ________. As shown in Figure 2-3-4, the worker uses a screwdriver to check whether the internal operation of the motor is normal. This phenomenon shows that ________ can transmit sound; the sound can be heard to determine whether the motor is running normally.

Whether the internal operation of the machine is normal, this takes advantage of the property that sound can transmit ________ (optional "energy" or "information").

[Analysis]All objects that make sound vibrate. If the object does not vibrate, there will be no sound. Solids can transmit sound better than liquids and gases. Using a screwdriver to detect whether the internal operation of the motor is normal uses the property of sound to transmit information.

[Summary of rules]Sonar, B-ultrasound, life detectors and other instruments receive sound waves and display the information carried by the sound waves after processing. Examples of using sound to transmit information can be roughly divided into two categories: one is the sound waves directly emitted by objects carrying information; the other is the reflected sound waves carrying information.

Type 2: Acoustic energy transfer energy

Example 2 2018·Panjin Listening to music with headphones for a long time and at high volume can damage the eardrums because sound can transmit ______, so it is necessary to reduce the ______ of the sound (optional "loudness" or "frequency").

[ Analysis

[Error-prone analysis]The nature of using sound to transmit information is to use sound to determine the characteristics, properties, position and other factors of an object, that is, to obtain certain information through sound. In the process of sound transmitting information, the structure, The shape and motion state will not change; the use of sound to transmit energy is to cause mechanical movement of objects or to break or reorganize them, that is, to use sound waves to achieve a certain purpose, which is manifested as changes in the motion state of the object or changes in shape and structure, etc.

PPT on the use of sound, part three: classroom feedback

1. Among the following items, sound can convey information ()

① The rumble of thunder indicates a possible heavy rain ② Sonar fishing ③ Ultrasonic lithotripsy ④ B-ultrasound examination ⑤ Use sound waves to clean spectacle lenses ⑥ Use a stethoscope to understand the condition of the patient's heart and lungs

A． ①⑤⑥ B. ②③④

C. ③⑤ D. ①②④⑥

2. The following examples use sound to transmit energy ()

A． Using ultrasonic waves to detect flaws in metal workpieces

B. Teeth cleaning using ultrasonic waves

C. Doctor diagnoses patient with stethoscope

D. Ultrasonic blind guide helps blind people travel

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