G8 Sound Waves Quizizz Review

Some waves need a medium to travel, while others do not. Waves that transfer energy through a medium; they are called mechanical waves. 有的波的运动传输能量需要介质，有的波的运动则不需要介质传播。我们把必须通过介质传递能量的波，称之为机械波。

• True

• False

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Waves such as sunlight can transfer energy through empty space and do not need a medium; they are called electromagnetic waves. 比如光波，可以在外太空传播，且不需要介质，这类不需要介质传递能量的波，我们称之为：电磁波。

• True

• False

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NGSS.MS-PS4-1

Sound waves, like other mechanical waves(机械波),

transfer energy(传递能量) through a substance(物质) called a _________.

• Medium 介质

• Disturbance 干扰

• Absorption 吸收

• Particles 粒子

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Waves are created when a source generates(产生) a _________.

• disturbance 干扰

• vibration 振动

• absorption 吸收

• medium 介质

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NGSS.MS-PS4-1

Referring to the chart on the right, which state of matter transfers sound the quickest: solid, liquid, or gas?

• solid

• liquid

• gas

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The mechanical waves(机械波) can be categorized(分类) into two types: __________ and __________ wave. (choose two options)

• longitudinal

• transverse

• vertical

• horizontal

How sound waves are reflected

(bounce back), are absorbed (stop within the medium), or

are transmitted (pass through) depends on the mediums

they encounter. 声波如何反射，吸收，传播，都取决于遇到的介质。

• True

• False

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_________ surfaces reflect sound more clearly, while rough surfaces can diffuse sound (reflect in many directions). _____表面能更清晰地反射声波，然而粗糙的表面会使声波扩散（向多个方向反射)。

• liquid

• hard

• soft

• smooth

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Porous or soft materials absorb more

sound than smooth surfaces. 相比于平滑的表面，多孔的且柔软的材质更容易吸收声波。Please give the explanation. 请选择正确的解释。

• Porous or soft materials are solid. Solids transmit sound better than liquids.

• Porous or soft materials have more air in them, so less sound energy is transmitted or reflected through them. Because of this, more sound energy is absorbed by the porous or soft materials.

• Porous or soft materials reflect sound more clearly.

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NGSS.MS-PS4-2

In the cartoon space rocket on the right, why do you think you would not be able to hear the whoosh(飞快移动呼呼声) of the rocket engine in space? （choose all that apply)

• The sound waves bounce back and forth until they lose energy.

• Sound waves can only travel through mediums.

• Space is a vacuum; no matter is present.

• Particles in space absorb the sound waves.