Cunk retains her tendency to take things literallyin the mockumentary special. “When hippies took mind-expanding drugs, how much wider did their minds get,” and “What’s a black hole… Sorry, a ‘hole of color’?” are just a couple of the familiar wordplay-based bits you’ll get ou...
which are noninteracting, emitted by excited calcium atoms in a two-stage spontaneous emission process. The polarization states of the photons, which are related to their spins, can be measured simply, with ordinary linear polarizers. Photomultiplier detectors count the individual photons, #1 (green)...
The charged particles interact with Earth’s magnetic field, and they’re pulled toward the North and South Poles. 带电粒子与地球磁场相互作用,它们被拉向北极和南极。 Some of them make it into our upper atmosphere, where they collide with atoms—with oxygen and nitrogen atoms. 其中一些进入了我...
Diamonds are made up of billions of carbon atoms and most were formed between one to three billion years ago, deep below the earth's surface under intense heat and high pressure. Older than humankind itself, diamonds are one of nature’s most incredible and unique gifts. Much like a snow...
Carbon is a very important part of life and life would not be possible without carbon on earth. Carbon has the ability to form bonds with other atoms...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your ...
HOW LIFE BEGAN ON THE EARTH 地球上生命的起源 No one knows exactly how the earth began, as it happened so long ago. However, according to a widely accepted theory, the universe began with a “Big Bang” that threw matter in all direction...
On Earth, gravity determines how the flame burns. All the hot gases in the flame are much hotter (and less dense) than the surrounding air, so they move upward toward lower pressure. This is why fire typically spreads upward, and it's also why flames are always "pointed" at the top....
For many years, scientists couldn't figure out how atoms and molecules on the Earth combined to make living things. Plants, fish, dinosaurs, and people are made of atoms and molecules, but they are put together in a more complicated way than the molecules in the primitive ocean. What's ...
The pressure is high enough to force atoms of hydrogen to come together innuclear fusionreactions — something we try to emulate here on Earth. Two atoms of hydrogen are combined to create helium-4 and energy in several steps: Two protons combine to form a deuteriumatom(hydrogen atom with on...
We'll then have a mess of quarks -- the type of quarks called "up" and "down," which have certain masses and are the only kinds found in matter on Earth. Squishing even more, we'll stress the up and down quarks so much that some change their identities. Some will get a lot ...