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Authoritative PPT Summary
"The Utilization of Sound" Sound Phenomenon PPT Courseware 6
1. Learning objectives
1. Knowledge and skills: Through learning, understand the application of sound in current technology.
2. Process and methods: Broaden students’ horizons and guide students to pay attention to the development of science and technology.
[Knowledge Point 1] Sound and Information
Read pages 38 and 39 of the textbook yourself and answer the following questions:
1. What activities in nature can generate infrasound waves?
2. Bats emit ____ during flight, and determine the location and distance of the target based on the direction and time reflected by ____. This method is called _____. Based on this principle, scientists invented ____ to detect _______ , draw _______ thousands of meters underwater, and you can also use sonar to obtain ____ information when fishing.
3. The doctor uses ______ to check the development of the fetus.
4. Use _______ to detect whether there are cracks in the boiler.
[Knowledge Point 2] Sound and Energy
Read the "Sound and Energy" section on pages 39-40 of the textbook to further clarify the application of sound energy.
The specific audible vibration frequency produced by ultrasonic waves is _____, and is often used for ________ and _________.
3. The world of science
Read Science World yourself and answer;
Questions below:
The Echo Gallery and the Temple of Heaven both use ___________
Compliance test
1. Which of the following statements is incorrect ( )
A. Use strong ultrasonic waves to drill and cut hard objects such as steel, gems, and diamonds.
B. In terms of architecture, when designing and constructing halls, the echo phenomenon must be considered as an important factor.
C. In oil exploration, the artificial earthquake method is often used, that is, a package of explosives is buried on the ground, a probe is placed, and the explosive is detonated. The probe can receive the sound waves reflected from the interface between different underground layers, thereby detecting underground oil mine
D.Using ultrasonic waves to predict earthquakes and detect typhoons
2. Medical B-ultrasound machines use ultrasound waves to diagnose conditions, but human ears cannot hear its sound. This is because ( )
A. The loudness of the sound is too loud B. The frequency of the sound is lower than the frequency range that the human ear can hear
C. The pitch of the sound is too low D. The frequency of the sound is too high for people to detect
3． There is an electronic toothbrush, as shown in Figure 1-7, which can emit ultrasonic waves directly to places where the brown bristles of the toothbrush cannot reach, so that brushing your teeth is both clean and comfortable. Regarding electronic toothbrushes, the correct statement is ( )
A. When brushing teeth, people cannot hear ultrasonic waves because ultrasonic waves cannot propagate in the air.
B. The pitch of ultrasound is very low, so humans cannot hear it
C. Ultrasonic waves are not produced by vibrations of objects
D． Ultrasound can transfer energy
4. Learning Summary
What is the takeaway from this lesson? Are there still things you don’t understand?
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