首页
登录
职称英语
Why roses are red and violets are blue? Did you ever wo
Why roses are red and violets are blue? Did you ever wo
游客
2023-12-18
26
管理
问题
Why roses are red and violets are blue?
Did you ever wonder why you see the colors you do or if other animals see the same colors that you see? We see light that bounces off of things around us. When the light enters our eyes, special cells tell our brains about the light. These cells are called photoreceptors. Light is made of little bits called photons. When the sun shines, trillions and trillions of these little bits of light fall on the earth. The photons bounce off of almost everything and some of them enter our eyes. Those bits that enter our eyes allow us to see. So, where does the color come from?
Starting in the 1600s with Sir Isaac Newton, scientists have believed that there are different kinds of photons. Different types give rise to our sense of colors. The different photons are said to have different wavelengths. Sunlight contains all the different wavelengths of photons. The visible wavelength colors can be seen when you look at a rainbow. Raindrops acting as natural prisms produce the colors.
HOW do our photoreceptors work?
We have two main types of photoreceptors called rods and cones. They are called rods and cones because of their shapes. These cells are located in a layer at the back of the eye called the retina. Rods are used to see in very dim light and only show the world to us in black and white. This is why you see only black and white when you are outside in the evening or in a dimly lit room. The other type of photoreceptors, the cones, allow us to see colors. They are not as sensitive as the rods so they only work in bright light. There are three types of cones, one for each of the three main colors we see, red, green and blue.
Some people have a genetic defect that makes one or more of the cones fail. This condition is known as color deficiency. You may have heard it called color blindness. Color blindness is fairly common, affecting about nine percent of all humans.’ It is much more common in men than in women. To test for color blindness a special picture called an Ishihara test is used.
What about other animals? What kind of colors do they see? Most animals see fewer colors than we do, but some see more! We know this by looking at how many kinds of cone
photoreceptors they have. Another good indication of what an animal can see is by looking at their own colors. The colors of their prey are also an indication of an animals ability to see color. [br] It can be inferred from the passage that ______.
选项
A、the human eye is sensitive to all wavelengths
B、colors are related to wavelengths
C、there are more color-blind women than color-blind men
D、failure of rods cause color-blindness
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3283615.html
相关试题推荐
Whyrosesareredandvioletsareblue?Didyoueverwo
Whyrosesareredandvioletsareblue?Didyoueverwo
Whyrosesareredandvioletsareblue?Didyoueverwo
Whyrosesareredandvioletsareblue?Didyoueverwo
Whyrosesareredandvioletsareblue?Didyoueverwo
Whyrosesareredandvioletsareblue?Didyoueverwon
Whyrosesareredandvioletsareblue?Didyoueverwon
Whyrosesareredandvioletsareblue?Didyoueverwon
Whyrosesareredandvioletsareblue?Didyoueverwon
Whyrosesareredandvioletsareblue?Didyoueverwon
随机试题
RoyWilkinswasamongthelastofagenerationofcivilrightsactivistswholed
Invain______togetintouchwiththeEmbassy.A、theytriedB、triedtheyC、did
以下四种气体间隙的距离均为10cm,在直流电压作用下,击穿电压最低的是()
将钢材加热到723~910℃以上,然后在水中或油中急速冷却,这种处理方式称为:A
B解析观察题干中的六个六角星图,可得每个图形中同一位置的角应该都出现3次。按此规律可知问号处的图组成如下:黑三角应该位于六角星的正上方,白三角应该位于六角星的
社会工作服务机构筹资时非常重视企业捐赠的动机。下列企业捐赠动机中属于“公共关系”
一、给定材料 2015年5月21日下午13时46分,云南砚山县
单位实施骗取贷款的行为,可以按照贷款诈骗罪追究刑事责任。()
(2019年真题)下列各项关于固定资产会计处理的表述中,正确的有()。A.
2018年1月1日甲公司购入乙公司同日发行的3年期公司债券,支付购
最新回复
(
0
)