American Geosciences Institute - Serving the Geosciences Since 1948 Modern physics Classical physics is usually concerned with everyday conditions: speeds much lower than the speed of light, and sizes much greater than that of atoms. Modern physics is usually concerned with high velocities and small distances. The term modern physics refers to the post-Newtonian conception of physics. Put simply, modern physics deals with the underlying structure of the smallest particles in nature ("quantum" mechanics), as well as a rigorous understanding of the fundamental interaction of particles, understood as forces. Small velocities and large distances is usually the realm of classical physics. Modern physics often involves extreme conditions; quantum effects usually involve distances comparable to atoms (roughly 10−9 m), while relativistic effects usually involve velocities comparable to the speed of light (roughly 108 m/s). Overview In a literal sense, the term modern physics, means up-to-date physics. Hallmarks of modern physics See also References A.
15 Games That Will Make You Think Differently About Games Using games for purposes other than entertainment is nothing new. There are war games, educational games, throne games. But a new class of games has sprung up in recent years, designed to create awareness and raise support for a variety of global issues. Such serious games seek to harness the power of competition and/or novelty to attract players and get the word out for a good cause. Here are 15 games you can play and be a better person for it. Catalysts for Change: On April 3, 2012, Catalysts for Change went live online for 48 hours. A Closed World: Game designers in Singapore created this game because of the shortage of content concerning LGBT issues. This is a cross-post from content partners at onlineuniversities.com
200th Activity Book For 200 years, NOAA has been focused on delivering "science, service, and stewardship." Making this happen leads the people of NOAA from the edge of space to the bottom of the ocean. To help you learn more about your world and how NOAA helps you explore, understand, and protect our Earth, we've put together this book with 43 different activities. Download the full activity book or individual activities. Activity Book (121MB, pdf) Activities: Introduction Book Introduction (7.18MB, pdf) NOAA Introduction (2.23MB, pdf) NOAA’s Building Blocks (3.62MB, pdf) Section: Explore the Earth Section: Understand The Earth Follow That Hurricane (4.38MB, pdf) Build Your Own Weather Station (1.56MB, pdf) Be A Citizen Weather Reporter (682KB, pdf) Tornado In A Bottle (1.33MB, pdf) Be A Tree Ring Detective (1.98MB, pdf) Your Own El Nino (1.22MB, pdf) Please Pass The Salt (1.65MB, pdf) Satellite Communications (2.27MB, pdf) Wooly Magma (1.64MB, pdf) Survey Mark Hunting (1.91MB, pdf) Section: Protect The Earth
Happy Birthday, Electron Electrons rule our world, but not so long ago they were only an idea. This month marks the 120th anniversary of a profound and influential creation, the electron theory of Dutch physicist Hendrik Antoon Lorentz. His electron was not merely a hypothesized elementary particle; it was the linchpin of an ambitious theory of nature. For most physicists the memorable peak of 19th-century physics is the theory of electrical and magnetic fields, capped by James Clerk Maxwell’s mathematical synthesis of 1864. To set the context, it is important to admit a blasphemy: Maxwell’s own exposition of his equations is a mess. Lorentz’s achievement was to purify the message of Maxwell’s equations—to separate the signal from the noise. Now one had definite equations for the behavior of tiny bodies with specified mass and charge. Much of Lorentz’s 1892 paper deals with the seductive, though not unproblematic, idea that the mass of electrons could be a consequence of their electric charge.
Disneynature Explore Modern Physics: An Historical Overview of the Development of Quantum Mechanics, Quantum Field Theory, Relativity, and Cosmology | Whiskey…Tango…Foxtrot? This timeline is is a greatly expanded version of that presented in Wikipedia’s article on the history of quantum mechanics, with milestones in the development of Relativity, cosmology, and particle physics also included due to their overlap in attempts to construct a Theory of Everything (TOE). Where possible, I’ve included references to the original founding documents related to each development, along with links to online copies of the original articles (or English translations thereof) where available. Please note that some of these documents are accessible by subscription only. In such cases, the articles should be viewable from the networks of institutions with site license access, such as universities or larger libraries. The Era of Classical Physics, and Cracks in its Foundations (Antiquity-1899) c. 510 BCE – 428 BCE – Anaxagoras (Ἀναξαγόρας) brought philosophy to Athens, and considered matter as consisting of indestructible primary elements. Kepler’s Laws of Planetary Motion 1.
NOAA/NASA SciJinks :: Why do leaves change color? Colorful fall leaves. Photo by Jeremy Baucom (Flickr Creative Commons) In the fall, trees put on a pretty impressive fashion show. Leaves that were green all summer long start to turn bright red, orange, and yellow. But where do these colors come from? It all starts inside the leaf. Chlorophyll (greens) Xanthophylls (yellows) Carotenoids (oranges) Anthocyanins (reds) Leaves are green in the spring and summer because that’s when they are making lots of chlorophyll. The summer sunlight triggers the leaves to keep making more chlorophyll. As summer fades into fall, the days start getting shorter and there is less sunlight. Shorter days in the fall are a signal for trees to start preparing for winter. Weather is also an important part of the color change. Extreme weather changes can also have an effect on the leaves. So if you want to know how long the colors will last this fall, be sure to keep an eye on the weather!
Birth of Modern Physics Photo: History @ Los Alamos: Los Alamos National Lab The primary responsibility of the Laboratory is assuring the safety and reliability of the nation's nuclear deterrent. Though the world is rapidly changing, this essential responsibility remains the core mission. The people of Los Alamos continually work on advanced technologies to provide the United States with the best scientific and engineering solutions to many of the nation's most crucial challenges. Yesterday The Laboratory was established in 1943 as site Y of the Manhattan Project for a single purpose: to design and build an atomic bomb. It took just 20 months. Hitler was defeated in Europe, but the Japanese Empire continued to wage an aggressive Pacific war. Today The Los Alamos of today has a heightened focus on worker safety and security awareness, with the ever-present core values of intellectual freedom, scientific excellence, and national service. Tomorrow The future is filled with promise.