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"The Utilization of Sound" Sound Phenomenon PPT
Part One: Preview Perception
1. Sound and information
1. Sound waves can transmit _______.
2. Echolocation: Determine the location of the target based on the _______ and _______ of the echo.
3. Applications of echolocation: B-ultrasound, reversing radar, _______.
2. Sound and energy
1. Sound waves can transmit _______.
2. Application: ______________, ______________.
PPT on the use of sound, part 2: interactive classroom understanding
echolocation
Echolocation (as shown in Figure A).
(1) Working process: emit sound waves → reflect echo → receive echo.
(2) Calculation method: s=1/2v sound × t total.
[Example] The depth of the ocean can be detected using a sonar system. In the direction perpendicular to the sea level, the sonar emits ultrasonic waves to the seafloor. If the echo signal from the seafloor is received after 4 s, the sea depth there is _______m (the speed of sound in seawater is 1500 m/s). However, ultrasonic sonar cannot be used for distance measurement in space (such as the distance between the earth and the moon) because of ______________.
Tips: This question examines ultrasonic ranging through examples. The key to answering the question is to clarify the principles and processes of ultrasonic ranging. A common mistake is to mistakenly take the product of the speed of sound and the total time as the measured distance, when in fact this distance is twice the measured distance.
Analysis: Ultrasonic waves can be used to detect the depth of the seabed s=vt=1 500 m/s× ×4 s=3 000 m. Since sound cannot propagate in a vacuum, it cannot be used for distance measurement in space.
Answer: 3 000 Sound cannot be transmitted in a vacuum
The use of sound PPT, the third part: try the application
1. Sound and information
1. The following examples that are not echolocation are ()
Echolocation is an application of sound waves to transmit information. It is a method used by people to imitate bats and use the reflection of ultrasonic waves to determine the target location, distance and size. Although medical ultrasonic tooth cleaning also uses ultrasonic waves, ultrasonic tooth cleaning uses the energy of ultrasonic waves instead of using echolocation to determine the position.
2. Earthquakes can cause serious damage to people's lives and property. After the earthquake, some people buried under the rubble, in order to save their physical strength, instead of shouting for help, they hit the walls or pipes with hard objects and asked for help from the rescuers. Finally, they were rescued. chance of survival. Using physics knowledge to explain, they used the principle that sound can spread in ___________, and in their help-seeking behavior, they used the knowledge that sound can convey _______.
When a person buried under the rubble knocks on the wall or pipe, the wall or pipe will vibrate and produce sound, and the sound will also spread along the wall and pipe to the outside, and then spread to the ears of the rescuers through the air. The rescuers will rescue after hearing it; this takes advantage of the characteristic that sound can convey information.
3. Bats emit __________ when flying. These sound waves will be reflected back when they hit walls or insects. The location and distance of the target can be determined based on the direction and time of __________ arrival. Based on this principle, scientists invented _______, which is used to detect fish schools, detect the depth of the seabed, etc.
Bats have poor eyes and limited vision. They use their "ears" to "see". When bats fly, they emit ultrasonic waves and determine the location and distance of objects based on the echoes they receive. Based on this principle, scientists invented Sonar.
2. Sound and energy
4. Among the following examples, sound is used to transmit energy ()
A. Determine the direction of the earthquake through infrasound waves received by acoustic instruments
B. Use ultrasonic blind guide to detect obstacles on the way forward
C. Use ultrasonic waves to crush stones in the human body
D. Use ultrasonic waves to detect flaws in metal workpieces
Option A, according to "judgment" and "azimuth", it can be known that the acoustic transmission information is used; Option B, according to "detection" and "obstacle", it can be known that the acoustic transmission information is used; Option C, according to "crushing" and "stone", it can be known that the acoustic transmission information is used It is the sound transmission energy; option D, according to "flaw detection", it can be seen that the sound transmission information is used.
5. Deep in the "Wet Valley" of the Kuksuk Grand Canyon in the Chinese Dinosaur Park, the staff used ultrasonic water mist machines to create a fairy tale world that is both real and illusory. Ultrasonic waves can break up water and form white mist. This is because ultrasonic waves have_______.
Sound energy is a type of energy produced due to vibration. Ultrasonic waves vibrate violently in the water, causing the water in the water tank to break into many small droplets, thus forming white mist. Ultrasonic waves can break up water and form white mist because ultrasonic waves have energy.
6. As shown in the picture, remove the covers at both ends of the can, cover one end with rubber film, tie it tightly with a rubber band, and knock the rubber film against the flame.
(1) The phenomenon you suspect may occur is _______.
(2)The basis for your guess is ______________.
When you tap the rubber membrane with your hand, the vibration of the rubber membrane generates energy that is transferred to the flame through the air.
(1)The flame will sway back and forth
(2) When sound propagates in the air, it will cause the air to vibrate (or sound can transfer energy)
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