Sound is produced by vibrations. When an object vibrates, it makes sound. How is sound produced? A. By colors. B. By vibrations. C. By shapes. 相关知识点: 试题来源: 解析 B。解析:声音是由振动产生的,B 选项正确。A 选项颜色和声音产生无关,C 选项形状也不是声音产生的原因。
1hat is sound?Sound isWcreated 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 are9a few diffe...
→ It might be cause either by an unbalanced load of laundry, or some foreign substance. The washing tub rotates at a quick speed during a spin cycle. If a load of laundry is small(i.e. one or two pairs of jeans) or big(i.e. several blankets), the tub may become unbalanced...
• Verify the washer is level. A wobbly washer can make rattling sounds as it vibrates. Leveling will prevent this • Make sure nothing is in contact with the washer. As an example, a common cause for a rattling noise is the power cord of the washer leaning against the washer as it...
It worked out!? How the Cane Works The cane sends out sound waves.When an echo is sent back,the top of the cane vibrates(震动).This helps the person 9 the cane know how far away an object is.He or she will also know how big the object is.? The 10 of the cane shows that nat...
This part-object (like the iron 'fist') would be an "automatic registration" of Chi much like Von Briesen's pen- cil drawings, who generated as many as 10,000 of these gestures a year! 'Becoming imperceptible' is performative. It calls forth the expe- rience of time, which Deleuze, ...
There’s also an anchor involved — a rubber boat-looking thing with a deep groove running from the front to the back. The retrieval cord is thick hollow rubber, so it’s a bit more conspicuous than the average tampon string. I was basically the physical equivalent of someone who just ...
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the literary form of autobiography(北二外 2008 研) Key: the literary form of autobiography:An autobiography is a person‘s account of his or her life. It is generally written in the first person, with the author speaking as ―I‖. Autobiography presents life events as the writer views them...
Answer to: Write a paragraph explaining what the Doppler Effect is and the different effects it has on the observed frequency when the source of...