Higher:
解释材料如何吸收声音
Middle:
描述可以吸收声音的材料
Lower:
举例说明如何保护听力
Higher:
解释为什么有些材料比其他材料更能吸收声音。
Middle:
进行吸音调查。
Lower:
预测结果并进行调查。
Why is it difficult to get absolute silence?
What would happen to your hearing it you listened to loud music using headphone, for long periods of time?
What happens to your hearing as you get older?
Why might your hearing get worst when you have an ear infection?
NA
The Science Behind the Science
Sounds travel through some materials more easily than others. Softer materials absorb sounds better than hard materials, which reflect sound, often producing echoes.
Sound insulation depends on a variety of factors, which include the type of material used, and the volume of the sound involved. In the most common situations the sound is travelling in air and, when it comes up against the insulating material, some of the sound is reflected back into the air. Thus the sound which enters the material is reduced and so has a lower volume. As it travels through the new material it is further reduced, especially if it is a soft, spongy material, which disrupts the sound waves so they become less regular.
Find patterns between volume of a sound and the strength of the vibrations that produced it.
Forces, electricity and waves - Vibrations and waves - By collaborating in experiments on different ways of producing sound from vibrations, I can demonstrate how to change the pitch of the sound. SCN 1-11a
Forces and Energy: the study of energy, its origin, storage and transfer, and the work it can do; the study of forces; the application of scientific understanding through inventions and machines.
Carrying out simple comparative tests.
Using results to draw simple conclusions.
Grade 3 - Sound.
3 年级 - 自然科学 - 力与能量 - 能量的形式 - 声音 - 你是怎样听到声音的？（保护听力）
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