The sun is a star. It gives us light and heat. How far is the sun from Earth? A. 150 million kilometers. B. 500 million kilometers. C. 1 billion kilometers. D. 5 billion kilometers. 相关知识点: 试题来源: 解析 A。太阳距离地球约 1.5 亿千米。选项 B、C、D 的距离与实际不符。
The sun is a star. It gives off light and heat. The Earth orbits around the sun. How does the Earth move around the sun? A. In a straight line. B. In a circle. C. In an oval. D. Randomly. 相关知识点: 试题来源: 解析 C。科普知识中地球绕太阳的轨道是椭圆形。选项 A 直线错误...
The Core is the only section of the sun that produces heat through fusion. The temperature is 15,700,000 Kelvin! The rest of the sun is heated by energy that is transferred outward from the Core. The energy produced by fusion in the Core must travel through successive layers to the ...
If the sun has enough power to warm and light the whole earth,it must have enough power to do other things,too.Can we use the sun’s abundant energy to supply electricity,or at least to perform the functions which electricity or other types of power usually perform?The answer is yes....
The Power of the Sun With a fusion reaction that’s consuming 620 million tonnes of hydrogen per second, it can be hard to picture just how powerful the Sun is. To put it into perspective, scientists estimate that the Sun produces about 3.8 x 10²⁶ joules of energy every second. On...
百度试题 结果1 题目微语境练The book is very useful for our study. It explains how th sun heat and light for millions of years. 相关知识点: 试题来源: 解析 gives off/out 反馈 收藏
百度试题 结果1 题目 (1) Without the light and heat the sun gives off, how can the plants on the earth grow? 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
But it’s a real marvel: The sun warms our planet every day, provides the light by which we see and is necessary for life on Earth. It can also cause cell death and make us blind. It could fit 1.3 million Earths inside its sphere [source: SpaceDaily]. It produces poem-worthy ...
What forms when the sun fuses hydrogen? What is the ultimate source(s) of energy that drives all processes on Earth? How do electromagnetic waves transfer energy? What produces all light energy? How does energy travel? How is synchrotron light created?
Once the photovoltaic process produces a current, the electricity has to flow somewhere. Since the current produced by a solar panel is DC, it needs to be converted into AC before it can be used in most situations. Once converted to AC, energy from solar can be used in multiple ways. T...