题干

μ子与氢原子核(质子)构成的原子称为μ氢原子(hydrogen muon atom),它在原子核物理的研究中有重要作用.图为μ氢原子的能级示意图.假定光子能量为E的一束光照射容器中大量处于n=2能级的μ氢原子,μ氢原子吸收光子后,发出频率为ν1、ν2、ν3、ν4、ν5和ν6的光,且频率依次增大,则E等于(    )

A:h(ν31)

B:h(ν56)

C:hν3

D:hν4

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答案(点此获取答案解析)

D

同类题1

阅读理解

        Washington: NASA has announced evidence that Jupiter's largest moon, Ganymede, has a saltwater ocean under its icy surface. The ocean seems to have more water than all the water on Earth's surface, according to new Hubble observation.

         New Hubble observations of Ganymede's magnetic field strongly suggest that the moon, which is the largest in our whole solar system, is home to a subsurface ocean.

        Scientists estimate the ocean is 95 kilometers thick, which is about 10 times deeper than Earth's oceans. But unlike our salty waters, Ganymede's ocean is buried under 150 kilometers of ice.

         While scientists have speculated(推测) since 1970s about the presence of an ocean on Ganymede—the largest moon in our solar system—until now the only observational evidence came from a brief flyby by the Galileo spacecraft, which didn't observe the moon long enough to confirm a liquid ocean.

         This discovery marks an important milestone, highlighting what only Hubble can accomplish. In its 25 years in orbit, Hubble has made many scientific discoveries in our own solar system. A deep ocean under the icy surface of Ganymede opens up further exciting possibilities for life beyond Earth.

        Scientists have already confirmed the existence of an ocean on Europe, another moon orbiting Jupiter, and NASA has announced plans to send an unmanned mission there searching for the life that might come with liquid water.

       Hubble is a telescope that orbits Earth, but because of its impressive gravitational analyses it can be used to study the inside of far distant planets. Using these same principles, scientists could theoretically detect oceans on distant planets as well.

同类题5

阅读材料,完成下列要求。

材料一:18世纪早期,英国城市人数约占总人口的20%-25%,1801年为33%,而到1851年时,英国已有580多座城镇,城镇人口占总人口的54%,英国已基本上实现了城市化。工业革命的深入发展,城市就业机会增多,形成了一股吸引农村移民的强大拉力。随着技术革新在棉纺织领域的展开,轻工城市率先异军突起。煤炭工业、冶金工业的发展,产生了一批能源和重工业城市。另外,交通运输业的变革,亦给英国平添了一批新的交通枢纽城市。城市化改变了英国的经济地理状况,使英国由一个封闭分散的农牧社会变为一个经济一体化的城市文明社会。

——摘编自陆伟芳《简析近代英国城市化的特征》

材料二:鸦片战争后,商埠的开放成为中国近代口岸城市兴起的契机。1842年,中英《南京条约》签订后,中国由广州一口贸易变为五口通商。第二次鸦片战争后,除开放沿海一系列口岸以外,又增辟了长江流域的沿江口岸。与此同时,在我国广大西南、西北的内陆边疆地区,陆路商埠城市也得到一定的发展。这类城市在北方有张家口、库伦、恰克图;西北有嘉峪关、喀什、伊犁、塔城;西南有云南的河口、思茅,广西的龙州,西藏的亚东、江孜等城市。以上内陆城市与沿海、沿江城同组成了我国近代口岸城市体系。——摘编自田兵权《中国近代城市转型问题初探》