首页
登录
职称英语
Any physical theory is always provisional, in the sense that it is only a hyp
Any physical theory is always provisional, in the sense that it is only a hyp
游客
2025-01-02
23
管理
问题
Any physical theory is always provisional, in the sense that it is only a hypothesis: you can never prove it. No matter how many times the results of experiments agree with some theory, you can never be sure that the next time the result will not contradict the theory. On the other hand, you can disprove a theory by finding even a single observation that disagrees with the predictions of the theory. As philosopher of science, Karl Popper has emphasized a good theory is characterized by the fact that it makes a number of predictions that could in principle be disproved or falsified by observation. Each time new experiments are observed to agree with the predictions the theory survives, and our confidence in it is increased; but if ever a new observation is found to disagree, we have to abandon or modify the theory. At least that is what is supposed to happen, but you can always question the competence of the person who carried out the observation.
In practice, what often happens is that a new theory is devised that is really an extension of the previous theory. For example, very accurate observations of the planet Mercury revealed a small difference between its motion and the predictions of Newton’s theory of gravity. Einstein’s general theory of relativity predicted a slightly different motion from Newton’s theory. The fact that Einstein’s predictions matched what was seen, while Newton’s did not, was one of the crucial confirmations of the new theory. However, we still use Newton’s theory for all practical purposes because the difference between its predictions and those of general relativity is very small in the situations that we normally deal with. (Newton’s theory also. has the great advantage that it is much simpler to work with than Einstein’s ! )
It turns out to be very difficult to devise a theory to describe the universe all in one go. Instead, we break the problem up into bits and invent a number of partial theories. Each of these partial theories describes and predicts a certain limited class of observations, neglecting the effects of other quantities, or representing them by simple sets of numbers. It may be that this approach is completely wrong. If everything in the universe depends on everything else in a fundamental way, it might be impossible to get close to a full solution by investigating parts of the problem in isolation. Nevertheless, it is certainly the way that we have made progress in the past. The classic example again is the Newtonian theory of gravity, which tells us that the gravitational force between two bodies depends only on one number associated with each body, its mass, but is otherwise independent of what the bodies are made of. Thus one does not need to have a theory of the structure and constitution of the sun and the planets in order to calculate their orbits:
Today scientists describe the universe in terms of two basic partial theories-the general theory of relativity and quantum mechanics. They are the great intellectual achievements of the first half of this century. Unfortunately, however, these two theories are known to be inconsistent with each other-they cannot both be correct. One of the major endeavours in physics today, is the search for a new theory that will incorporate them both-a quantum theory of gravity. We do not yet have such a theory, and we may still be long way from having one, but we do already know many of the properties that it must have. [br] Which of the following signified that a new theory was established?
选项
A、The general theory of relativity makes more accurate prediction of the motion of Mercury than the theory of gravity.
B、It is much simpler to work with the theory of gravity than with the general theory of relativity.
C、The general theory of relativity evolved from the theory of gravity.
D、The general theory of relativity is used for scientific research while the theory of gravity is used for all practical purposes.
答案
A
解析
第二段先指出,任何新理论都是对已有理论的扩展,然后以牛顿的地心引力定率和爱因斯坦的相对论为例指出:确定相对论为新理论的关键因素是,与地心引力定率相比相对论预测得更精确(见该段第四句)。因此正确答案是A。
转载请注明原文地址:https://tihaiku.com/zcyy/3895413.html
相关试题推荐
Itseemsthatphysicalactivitiesinevitably______,whichimprovesfitness.[or
DarwinandHisTheoryDarwinwasbornin1809asthes
DarwinandHisTheoryDarwinwasbornin1809asthes
DarwinandHisTheoryDarwinwasbornin1809asthes
DarwinandHisTheoryDarwinwasbornin1809asthes
DarwinandHisTheoryDarwinwasbornin1809asthe
DarwinandHisTheoryDarwinwasbornin1809asthe
DarwinandHisTheoryDarwinwasbornin1809asthe
DarwinandHisTheoryDarwinwasbornin1809asthe
DarwinandHisTheoryDarwinwasbornin1809asthe
随机试题
YourLifeTheirHandsAOnbenchesinparks,youcanb
Manypeoplewholiveincitiessaythattheydislikecitylife.Theysaythe
下列关于造孔成槽的说法正确的是()。A.钻劈法一般要求主孔先导8~10m B.
直剪试验的目的是测定() A.τ,σ B.c,ψ C.σ1,σ3 D
某怀孕9个月的产妇,近中阻生,近1周来牙冠周围出现牙龈红肿,此时比较适宜的治疗方
A.1、2、3 B.2、4、5 C.2、4、6 D.3、6、7
社会工作者小李在与流动儿童阳阳一家会谈的过程中,了解了阳阳的学习生活状况,与阳阳
(2017年真题)产品发售数量少、产品类型单一和资金规模较小是属于银行理财产品市
结构性理财产品的主要风险包括()。A:挂钩标的物的价格波动B:本金风险C:收
病例摘要:患者,男性,28岁,已婚,职员,因饮酒后腹痛半天就诊。患者半天前快速大
最新回复
(
0
)