"Application of Sound Phenomenon in Science and Technology" Sound Phenomenon PPT Courseware 2

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"Application of Sound Phenomenon in Science and Technology" Sound Phenomenon PPT Courseware 2

ultrasound

Bats fly at night and can also catch moths and mosquitoes. In any case, they have never collided with anything. Even a very thin wire can be avoided nimbly.

interesting inquiry

Scientists conducted an experiment: they sealed the bat's eyes with wax and allowed it to continue flying. As a result, it not only flew normally, but also could catch flying insects. Then plug the bat's ears and let it fly. As a result, the bat, which has lost its hearing, crashes everywhere and even hits the ground. It turns out that bats use their ears to "see" everything in the outside world.

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Small information

In 1912, the "Titanic" hit a reef and sank on its first voyage. This incident shocked the world, and immediately someone proposed to use acoustic methods to remotely detect icebergs on the waterway, thus creating sonar (echo sounder). Then in World War I, research on sonar was further developed out of the need to detect enemy submarines.

Ultrasonic applications

1. Strong directionality. Ultrasonic waves are easily gathered into a directional beam and are reflected back when encountering objects, and can travel far in water.

Sonar can be used to detect the depth of the ocean, schools of fish, reefs, and enemy submarines.

2. Ultrasound waves are reflected at the interfaces of different tissues in the human body. Doctors use "B-ultrasound" to observe the internal organs of the human body and help make diagnosis.

3. Strong penetrating ability. Ultrasonic flaw detectors are used in industry to detect cracks and other hidden dangers inside metal parts.

4. When ultrasonic waves propagate inside the liquid, they can cause the liquid to vibrate violently and are used for cleaning, processing and disinfection.

The use of ultrasonic waves can remove dirt from the surface of small objects, and it is even more advantageous to use it to clean lenses. Nowadays, many air humidifiers also use ultrasonic waves to atomize water and humidify the air.

infrasound

1. Generation: Typhoons, earthquakes, nuclear explosions and missile launches can all be generated.

2. Application: Forecast highly destructive typhoons and tsunamis; can detect nuclear explosions and missile launches thousands of kilometers away.

Small information

In 1890, the British ship "Marlborough" suddenly and mysteriously disappeared while sailing from New Zealand to England. More than 20 days later, it was discovered on the edge of Tierra del Fuego. Everything on the ship was intact and intact. Even the dead crew members were in their places and maintaining their working posture. After years of research, scientists finally revealed that the cause of this mysterious incident was that the crew died from infrasound waves generated by a strong storm.

After evolution, many animals, such as bats and dolphins, have perfect organs for transmitting and receiving ultrasonic waves. Studying the structure and function of organs in animals to improve existing equipment and develop new equipment is the research field of bionics.

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"Application of Sound Phenomenon in Science and Technology" Sound Phenomenon PPT Courseware 4:

"Application of Sound Phenomenon in Science and Technology" Sound Phenomenon PPT Courseware 4 Self-study text, answer questions 1. What is the frequency range of sound waves? 10-4～1012Hz 2. What is the frequency range of sound heard by normal human ears? 20 ~ 20000Hz 3. The sound that dogs can hear is the loudest...

"Application of Sound Phenomenon in Science and Technology" Sound Phenomenon PPT Courseware 3:

"Application of Acoustic Phenomenon in Science and Technology" Acoustic Phenomenon PPT Courseware 3 Knowledge Review 1. The frequency range heard by the human ear is _______ Hertz to _________ Hertz. 2. Sound waves greater than 20,000 Hz are called __________ 3. Sound waves less than 20 Hz are called __________ ultrasonic waves..

"Application of Sound Phenomenon in Science and Technology" Sound Phenomenon PPT courseware:

"Application of Sound Phenomenon in Science and Technology" Sound Phenomenon PPT Courseware [Experience] Try it out and listen Activity: Take a cylindrical food can as shown in the picture, open a round hole at one end and remove the bottom surface from the other end, cover it with a rubber film and use a rubber band truss. Light the candle on the table and the candle flame no longer...

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Update Time: 2024-11-18

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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