2 When a beam of light is incident on a surface, it delivers energy to the surface. The intensity of the beam is defined as the energy delivered per unit are a per unit time.What is the unit of intensity, expressed in SI base units? I A$$ k g m ^ { - 2 } s ^ { - 1 }...
4 A beam of light will not bend(弯曲)round corners unless ___ to do so with the help of a reflecting device(反射装置). A. made B. being made C. having made D. to be made 5【题文】A beam of light will not bend(弯曲)round corners unless___ to do so with the help of a...
“Ecological design” is the name John gives to what he does. “Life on Earth is kind of a box of spare parts for the inventor,” he says. “You put organisms in new relationships and observe what’s happening. ...
S.B. is supported by RSF grant no. 23-12-00166 and thanks IAP for hospitality, as this was where part of this work was done. The research leading to these results received support from the French Agence Nationale de la Recherche (ANR grant no. 17-CE31-0011-01/project HIH2, principal...
A laser is a beam (光束) of light that has many strange qualities (特性). By using a laser it is possible to throw very large and very clear pictures on the screen. They may be as large as three metres. Many people could watch this kind of television together. Laser beams have also...
They reflect a___(concentrate) beam(束)of light onto the town's central square, creating an area of sunlight roughly 600 square meters. 解析 考查过去分词。句意:它们把一束集中的光线反射到城镇的中心广场上,形成了一块大约600平方米的日光区。concentrate是动词,意为“集中”。过去分词concentrated意为...
因此,B项实际上相当于it is made,it is被省略。本句大意为:除非装有反射作用的设备,否则一束光不会在角落处拐弯。 结果一 题目 A beam of light will not bend round the corners unless___ to do so with the help of a reflecting device. A.being done B.to be made C.made D.having made ...
the following year, the young couple’s baby son was baptized(受洗礼). Among the __25___ the newborn baby received, I placed his mother’s bracelet, now shining like new . I hope that if my grandson ever loses it, one of the blackbirds that live in my backyard is somewhere nearby...
[答案精解] 如果不用反射装置使光线弯曲的话,光线在拐弯处是不会弯曲的。unless made=unless it is made;状语从句中省略了it is; with the help of意为“在…的帮助下”。结果一 题目 A beam of light will not bend round comers unless made to do so with the help of a reflecting device() A.除...
"To obtain an idea of the size of a light-year, take the circumference of the Earth (24,900 miles), lay it out in a straight line, multiply the length of the line by 7.5 (the corresponding distance is one light-second), then place 31.6 million similar lines end to end," NASA's ...