radiation

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17 08, 2017

Nuclear fission – Physics

By |2018-05-31T11:49:26-07:00August 17th, 2017|Physics|2 Comments

Nuclear fission: Atomic bomb explosions make a "mushroom cloud" Fission reactions are the kind of nuclear reaction we use for nuclear power plants and nuclear submarines, and also to set off a nuclear bomb. With fission reactions, you take very large atoms like uranium and plutonium and smash them apart into smaller atoms. Because it takes a [...]

16 08, 2017

What is a photon? Physics of light

By |2018-05-31T11:49:28-07:00August 16th, 2017|Physics|8 Comments

Photons - Sunshine breaking through the clouds. When did the first photons appear? A photon is a tiny little particle of light, far too small to see individually. All light is made of photons (FOE-tahns). The earliest photons probably appeared about fifteen billion years ago, during the Big Bang. What's the speed of light? Unlike electrons and quarks, [...]