【题目】A Light(光) travels very fast. It moves at a speed of 300, 000 kilometers a sccond(秒). Light reaches us from the moon in less than one and a half seconds. The moon is about 382,000 kilometers away from the earth.Light from the sun gets to us in 8. 5 minutes. It'...
It moves at a speed(速度) of 300, 000 kilomcters(千米) a second. Light reaches(=gets to) us from the moon in less than a second and a half. The moon is almost 382, 000 kilometers away. The sun is about 149,840,000 kilomcters away from the carth. The other stars are farther...
Speed of Light: Light moves at a definite speed of3×108m/s. It was first predicted that light is an electromagnetic wave which is the simultaneous and synchronized oscillations of electric and magnetic fields. Later it was found that light also has particle nature and is composed of photons...
Mick Moves at Speed of Light
Today we know that light moves at a definite speed of around 299,792 kilometers per second in vacuum. This value has been measured using advanced technology and methods which have been devised using years of research and experience. Earlier there were different methods used to measure the speed...
It moves at a speed of 300,000 kilometers a second. Light reaches us from the moon in less than a second and a half. The moon is about 382,000 kilometers away. Light from the sun reaches us in 8.5 minutes. The sun is about 149,840,000 kilometers from the earth....
【题文】 Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km, but sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away ...
根据短文第一句话Light travels at a speed which is about a million times faster than the speed of sound.可知光的传播速度比声音的传播速度要快一百万倍；故选D。小题2:细节理解题。根据短文第一段最后一句话If you stand some distance(距离) away from the starter, you can see smoke ...
【题目】Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km, but sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from...
(3)A (4)C 【解析】本文是一篇说明文,作者介绍了光的传播速度要远远高于声的传播。本文描述了一种奇怪的自然现象,引起了人们的思考。 (1)考查细节理解。根据第一段中的“Light travels at a speed which is about a million times faster than the speed of sound.”可知光的传播速度比声音的传播速度要快一...