A. Seeing a rainbow. B. Looking at a fish in water. C. Shadows formed by an object. D. The appearance of a mirage. 相关知识点: 试题来源: 解析 C。物体形成的影子是光沿直线传播的例子。A 选项彩虹是折射和色散;B 选项看水中的鱼是折射;D 选项海市蜃楼是光的折射现象。反馈...
Light travels in a straight line can be observed by keeping an object in path of light. In atmosphere which is bit dusty, we can see light traveling in straight line.
The speed of light traveling through a vacuum is exactly 299,792,458 meters (983,571,056 feet) per second. That's about 186,282 miles per second — a universal constant known in equations as "c," or light speed. According to physicistAlbert Einstein'stheory of special relativity, on whi...
What does the underlined word "dead" in paragraph 3 probably mean?A.SilentlyB. Gradually.C. Regulaly.D. Completey.34. Which of the following could be used as a way for an animal to become transparent?A. Changing the direction oflight traveling.B. Gathering materials to scatterlight.C. ...
Traveling Through Space Most waves require a medium to travel in. For example, if you drop a rock in a pond, it makes waves in the water. No water, no waves. Because light consists of photons, however, it can travel through space like a stream of tiny particles. The photons actually ...
this effect occurs when a laser pulse, interacting with the medium it's traveling through, compresses itself into a tight beam. The researchers showed that in this process, STOVs are responsible for directing the flow of energy and reshaping the laser, pushing energy together at its front and...
D.traveling 免费查看参考答案及解析 题目: To save electricity, please keep the light ___ when you are not using it.A.offB.outC.over 免费查看参考答案及解析 题目: 你房间的灯还亮着,你离开之前不要忘记把它关掉。The light in your room is still on. Don’t forget to ___ ___ it bef...
In some situations the light that enters a new medium becomes totally contained within the medium—a phenomenon known astotal internal reflection. This occurs when waves are completely reflected off a boundary through which the waves are traveling. In a fiber optic tube, for example, light enterin...
electromagnetic radiation of any wavelength (as infrared, visible, ultraviolet, and X-rays) and traveling in a vacuum with a speed of about 186,000 miles (300,000 kilometers) per secondespecially: such radiation that is visible to the human eye ...
travels C. is traveling D. was traveling 免费查看参考答案及解析 题目: —Have you seen the light Show in the city center—Yes. It is really wonderful. It lights up the sky.A.makes...high B.makes...bright C.makes...clean 免费查看参考答案及解析 题目: It's late into night but ...