Sound iscreated when an objectvibrates(振动).Thevibrations travel in waves.Sound waves reach our ears.The ears send a message to the brain. That's how wehear different sounds! A sound can be loud or quiet Itcan have a high pitch(音高) or a low pitch. Here area few different sounds....
Mechanical waves require a medium to carry over energy, whereas electromagnetic waves can move through a vacuum and do not need any medium for propagation.Answer and Explanation: The properties of waves are: Amplitude - It is the displacement moved by a point on a vibrating body. It is usua...
Seismic waves are used to measure the internal structure of the Earth, as waves can be refracted, reflected, or change in velocity depending on the substance through which they're traveling.Answer and Explanation: Seismic waves and sound waves are both a type of mechanical wave. Mechanical waves...
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Science has told us so much about the moon that it is quite easy to form an idea of what it would be like to go there. It is certainly not a friendly place. As there is no air or water, there can be no life of any kind. Mile after mile there are only plains(平原) of dust ...
For sound waves to sound waves, an originating source might be a pair of vocal chords, a stereo speaker, or a tree falling in the forest. A long-held philosophical discussion has surrounded the question, "If a tree falls in the forest and no one is around to hear it, does it ...
Sound is a wave, a longitudinal wave Sound needs a medium to travel Waves have an amplitude (volume), frequency (pitch), wavelength (speed), etc. The science of sound: how sound waves work In the air, 331 meters per second (MPS) creates something of a "chain reaction," If you watch...
The physical distance between two consecutive crests or troughs in a sound wave is referred to as a wavelength. Amplitude –In sound waves, amplitude refers to the magnitude of compression or expansion experienced by the medium the sound wave is travelling through. ...
3. 从文章的句子;The moon is also a very silent(安静的) world, for sound waves (声波)can only travel through air.可知是月球上没有空气。选B。4. 从文章的句子;Above, the sun and stars shine in the black sky.可知答案是B。5. 从所在的句子看，dust是泥土的意思。选B ...
It is often compared to the sounds of ocean waves or rain. So, while white noise is evenly distributed across frequencies, pink noise focuses more on the lower end of the sound spectrum. Brown Noise vs. White Noise White noise and brown noise are types of sound signals that differ in ...