What causes a rainbow? A. There are many balloons. B. The sun shines through the rain. C. The birds build nests. 相关知识点: 试题来源: 解析 B。选项 A 有很多气球与彩虹的形成无关。选项 C 鸟儿筑巢也不是彩虹的成因。选项 B 的意思是太阳透过雨照射,这会形成彩虹。
angle of 42 degrees.If you draw an imaginary line from your eyes to the rainbow, and then back to the sun, that angle will always be 42 degrees. However, the sun has to be behind you, not in front of you, because the light gets refracted back in the general direction it came from...
Sun dogsoffer another opportunity to see fragments of rainbow in the sky. Like iridescent clouds, they too form whenever sunlight interacts withice crystals—except the crystals must be larger and plate-shaped. As sunlight hits the ice crystal plates, it isrefracted—it passes through the crystals...
What Causes a Rainbow?
(4)Whatcausesustoexploremorewhenweseetheimpossible? ___A.Thesearchforanswers.B.Thelessonfrommistakes.C.Theideaofdoubtingourselves.D.Theneedtogetendlessdetails.(5)Whatdoesthewriterthinkofbeingmisunderstood? ___A.Funny.B.Boring.C.Acceptable.D.Unbelievable. 相关知识点: 试题来源: 解析 【答案】(1...
What causes them? Have you ever looked up in the sky and noticed colored spots on either one or both sides of the sun? Bright spots that looked like tiny rainbows? If so, you probably saw a sun dog, also known as mock sun or parhelia, which means "with the sun." ...
What Causes A Fire Rainbow? Fire rainbows or circumhorizontal arcs appear when special conditions are met. First is the passage of light through these high-level cirrus clouds at a specific angle. Next is the position of the Sun. A fire rainbow can only be witnessed when the Sun is at le...
The shape of a rainbow is a result of therefractive indexof water. This causes the sunlight to be reflected off rain droplets within a limited range of angles that lie between 0° and 42°. Most of the light is cast back at you in an angular range from 40° for violet light to 42...
The rainbow of colors show up once trees stop producing chlorophyll. "They start to fall typically when the photoperiod, meaning the length of the day, begins shortening," said Kira Pollack, a University of Minnesota Extension Educator.
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