问题 填空题

如图中甲所示是苹果公司于2012年12月推出的Iphone5手机.

(1)该手机使用时是以______来传递信息的;

(2)Iphone5手机电池电压为5V,待机时电流约10mA,则Iphone5待机时的电功率为______W;若一块原装Iphone5电池充满电可供其待机200h,则该电池一次充满电时储存的电能为______J.

(3)现利用其先后拍下同一轿车的两张照片如图乙、丙所示(设摄像头焦距不变),拍摄照片乙与拍摄照片丙相比,拍摄______(填“乙”或“丙”)时摄像头离轿车更近些.

答案

(1)iphone5手机使用时是利用电磁波来传递信息的;

(2)Iphone5待机时的电功率为P=UI=5V×0.01A=0.05W;该电池一次充满电时储存的电能为W=Pt=0.05W×200×3600s=36000J;

(3)摄像头的镜头相当于凸透镜;

由图乙和图丙可知,乙与丙都是汽车缩小的实像,

乙的像小于丙的像,因此乙的物距大于丙的物距,

拍摄丙时摄像头离小车更近些;

故答案为:(1)电磁波;(2)0.05;36000;(3)丙.

单项选择题

Pretty in pink: adult women do not remember being so obsessed with the colour, yet it is pervasive in our young girls’ lives. It is not that pink is intrinsically bad, but it is such a tiny slice of the rainbow and, though it may celebrate girlhood in one way, it also repeatedly and firmly fuses girls’ identity to appearance. Then it presents that connection, even among two-year-olds, between girls as not only innocent but as evidence of innocence. Looking around, l despaired at the singular lack of imagination about girls’ lives and interests.

Girls’ attraction to pink may seem unavoidable, somehow encoded in their DNA, but according to Jo Paoletti, an associate professor of American Studies, it is not. Children were not colour-coded at all until the early 20th century: in the era before domestic washing machines all babies wore white as a practical matter, since the only way of getting clothes clean was to boil them. What’s more, both boys and girls wore what were thought of as gender-neutral dresses. When nursery colours were introduced, pink was actually considered the more masculine colour, a pastel version of red, which was associated with strength. Blue, with its intimations of the Virgin Mary, constancy and faithfulness, symbolised femininity. It was not until the mid-1980s, when amplifying age and sex differences became a dominant children’s marketing strategy, that pink fully Came into its own, when it began to seem inherently attractive to girls, part of what defined them as female, at least for the first few critical years.

I had not realised how profoundly marketing trends dictated our perception of what is natural to kins, including our core beliefs about their psychological development. Take the toddler. I assumed that phase was something experts developed after years of research into children’s behaviour: wrong. Turns out, according to Daniel Cook, a historian of childhood consumerism, it was popularised as a marketing trick by clothing manufacturers in the 1930s.

Trade publications counselled department stores that, in order to increase sales, they should create a "third stepping stone" between infant wear and older kids’ clothes. It was only after "toddler" became a common shoppers’ term that it evolved into a broadly accepted developmental stage. Splitting kids, or adults, into ever- tinier categories has proved a sure-fire way to boost profits. And one of the easiest ways to segment a market is to magnify gender differences—or invent them where they did not previously exist.

According to Paragraph 2, which of the following is true of colours()

A. Colours are encoded in girls’ DNA

B. Blue used to be regarded as the colour for girls

C. Pink used to be a neutral colour in symbolising genders

D. White is prefered by babies

单项选择题 A1型题