"The Utilization of Sound" Sound Phenomenon PPT Teaching Courseware

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"The Utilization of Sound" Sound Phenomenon PPT Teaching Courseware

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Sound and information

1. A certain school held an earthquake escape drill. Students heard the siren on the radio and quickly left the classroom, indicating that sound waves can transmit information.

2. Bats emit ultrasonic waves, which are reflected back after hitting obstacles. Based on the echo, the position and distance of the object can be determined. Sonar is based on the principle of echolocation.

Knowledge Point 2 Sound and Energy

3. As shown in the picture, place a lit candle in front of the speaker. When the speaker emits a strong sound, you can see the candle flame swaying with the rhythm of the music. The sound generated by the speaker is transmitted to the candle flame through the air. The shaking of the candle flame indicates that the sound has energy.

4. The picture shows a scene from a certain episode of CCTV’s “Is It Real?”: Drill a round hole in the bottom of a plastic bucket, cover the mouth of the bucket with a thick plastic film, place the round hole in front of the paper cups stacked a few meters away, and tap the plastic film , while hearing the flapping sound, you will see the paper cups falling one after another. The sound you hear is caused by the vibration of the object. The phenomenon of the paper cup being knocked down shows that sound waves can transfer energy.

PPT on the use of sound, part 2: improvement of comprehensive capabilities

5. Experienced beekeepers can judge whether a bee has collected honey by listening to its "buzzing" sound, indicating that sound can transmit information; the use of ultrasonic waves to clean glasses takes advantage of the property of sound waves to transmit energy.

6. When checking whether there is water accumulation in the abdomen, doctors often tap the patient's abdomen gently with their hands and listen carefully to the sound. This is called "percussion". Doctors can use this to determine whether there is water accumulation in the patient's abdomen, indicating that sound can convey information.

7. On the winding railway line, the "rail doctor" uses a flaw detector to perform a "B-ultrasound" on the railway track, which uses sound to transmit information. The ultrasonic waves emitted by the flaw detector cannot be heard by human ears because the frequency of the ultrasonic waves is too high.

8. For safety, some cars are equipped with reversing radar (as shown in the picture). When the car is reversing and the rear encounters people or obstacles within a non-safe distance, the radar will sound an alarm to facilitate the driver to judge the rear and rear of the car. The distance between obstacles. In the working process of the reversing radar, physical knowledge such as "sound can transmit information", "echo" and "ultrasonic wave" (optional "sound can transmit information", "sound can transmit energy", "echo" or "ultrasonic wave") are applied.

9. Which of the following statements about the use of sound is correct (B)

A. Infrasound waves are often used in medicine to break up stones.

B. Using ultrasonic waves for metal flaw detection shows that sound can transmit information

C. Pour boiling water into the thermos bottle and judge whether the bottle is full based on the loudness.

D.Using ultrasonic waves to predict the intensity and location of nuclear explosions

10. It is said that a technology company located in San Diego, California, has developed a gun that uses ultrasonic waves as bullets. Scientists found in experiments that when sound waves reach a certain intensity, they can penetrate several walls without being weakened, and can also penetrate stones, bricks and metal. Traditional houses and barriers are not safe when encountering this kind of weapon. But if there is a very thin isolation zone around the target being attacked, this type of weapon will be useless. This kind of thin isolation zone is (A)

A. Vacuum belt B. Steel belt

C. Glass tape D. Sponge tape

The use of sound PPT, the third part: Expansion, exploration and breakthrough

16. In 1912, the British cruise ship "Titanic" suffered a tragedy when it collided with an iceberg and sank on its first voyage. The shipwreck attracted worldwide attention. In order to search for sunken ships, American scientists designed and built the first echo sounder to measure underwater targets, and successfully discovered an iceberg 3 km away in 1914. During World War I, German submarines sank a large number of Allied warships and ships, almost interrupting the maritime transportation lines across the Atlantic. At that time, the submarine was underwater, invisible, intangible, and invincible. The famous French physicist Langevin and others researched and manufactured the first active sonar, which made the German submarines unable to hide and suffered catastrophe.

(1) When using sonar to measure the depth of the seabed, one physical quantity and symbol that must be known is the propagation speed of sound in seawater v water. One physical quantity and symbol that must be measured is the time t between sending a signal and receiving a signal, and the depth of the seabed. Expression s= (v_"water" t)/2　;

(2) In order to detect the depth of a certain place on the seabed, scientists emit ultrasonic waves vertically to the seafloor. After 4 s, they receive an echo signal. How many meters is the depth of that place in the ocean? (The propagation speed of sound in seawater is 1500 m/ s )?

Solution: s=(v_"water" t)/2=(1500" " m"/" s×4" " s)/2=3000 m

(3) This method cannot be used to measure the distance between the moon and the earth. What is the reason?

Sound cannot travel through a vacuum.

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Update Time: 2024-09-08

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

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