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"Hazards and Control of Noise" Acoustic Phenomenon PPT (Class Assignment)
Reaching standards and consolidating
1. Fill in the blanks
1. Figure 8-K-1 shows the waveform diagrams of two sounds. It can be seen from the figures: Figure ________ is the waveform of musical sound, and Figure ________ is the waveform of noise.
2. Xiao Lin was dancing happily in the living room listening to pop music, while his brother who was doing homework in the study closed the door. This is because pop music is ________ to Xiao Lin, but to my brother, it is ________.
3． People use __________ as a unit to express the level of sound intensity, and its symbol is _________. ________dB is the weakest sound that people can hear; to protect hearing, the sound should not exceed ________dB; to ensure rest and sleep, the sound should not exceed ________dB.
4. As shown in Figure 8-K-2, it is an electronic noise monitor. At a certain moment, the display screen of the device displays the value as shown in the figure. The unit of this value is ________. This value represents the _ of the ambient sound at that time. _______(optional "pitch", "loudness" or "timbre"). Use the noise monitor________ (optional "can" or "cannot") to reduce noise.
5. "Covering one's ears and stealing a bell" is a very familiar story. From a physics point of view, the mistake the thief made was that he neither had a _________ to block the sound nor a _________ to block the sound, but only prevented the sound from entering his own ears.
2. Multiple choice questions
6. Which of the following statements about music and noise is correct ()
A． Music is pleasant to the ear and will definitely bring enjoyment to people, while noise can make people irritated and harmful to their health.
B. Music is the sound produced by musical instruments, noise is the sound produced by machines
C. From the perspective of environmental protection, musical sound vibrations always follow certain rules, while noise vibrations are chaotic and have no rules to follow.
D. From an environmental perspective, all sounds that hinder people from resting, studying, living, and working are noise.
7．2016·Guang’an Please understand carefully that in the following scenes, what is noise ()
A． Fans roaring with excitement on the football field
B. In the residential area, the deafening "Baba Dance" music sounds at night
C. In the dance hall, sonorous and powerful percussion sounds
D. At the station, the sound of an announcement reminds passengers to check in and board the train.
8．2017·Ezhou Near schools, hospitals and scientific research departments, there are signs prohibiting honking as shown in Figure 8-K-3. Among the following measures, the same as this method of controlling noise is ()
A． Worker puts on anti-noise earmuffs
B. Install soundproofing panels next to roads
C. Close classroom doors and windows during class
D. Install a muffler on a motorcycle
9．2017·Chenzhou Noise has become one of the important factors of environmental pollution in modern cities. Which of the following measures cannot directly reduce noise ()
A． Plant trees along roads and around buildings
B. Install mufflers on exhaust pipes of motorcycles and cars
C. Install noise monitors on both sides of major urban roads
D. Textile worker wears earmuffs while working in workshop
10. Some roads in the city are designed as shown in Figure 8-K-4. The role of such concave roads in controlling noise is ()
A． Prevent vehicles from making noise
B. Reduce noise at the source
C. Reduce noise at the human ear
D. Reduce noise during propagation
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