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Anonymous users2024-01-24The sound source travels during the human ear.
Question Analysis: Ways to reduce noise: (1) attenuation at the sound source; (2) weakened during propagation; (3) Weakened in the human ear.
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Anonymous users2024-01-23(1) Put a rag on the place where it is knocked to reduce the noise at the sound source;
Closing the doors and windows of the room and kitchen is weakened in the process of transmission;
instructed Xiao Ming to temporarily plug his ears with headphones to reduce the noise at the receiving place;
2) When there is a strong sound in the horn, you can see that the candle flame is beating;
The beating of the candle flame is produced by the vibration of the air caused by the sound of the horn, illustrating that air can transmit sound and sound can transmit energy
3) Because the morphology and structure of different tissues in the workpiece are not the same, the propagation speed of ultrasonic waves in different media is different, so the degree of reflection and refraction and absorption of ultrasonic waves is also different, according to which the position of the workpiece scar can be judged
So the answer is: sound source; during transmission; human ear; Energy; The speed of sound is different
Put a rag on the place where you are knocked to reduce the noise at the sound source; >>>More
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