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Physics Facts

Somewhere Over Which Rainbow?

How many rainbows are there really when we only see one during a rainstorm? The answer isn't as simple as you might think! Rainbows are formed when light enters a water droplet, reflects once inside ... Continue reading

Double rainbow, note the color reversal in the faint, secondary rainbow.

The Equivalence Principle

Four hundred years ago--or so the story goes--Galileo Galilei started dropping things off the Leaning Tower of Pisa: Cannon balls, musket balls, gold, silver and wood. He might have expected the ... Continue reading

X-Rays - Another Form of Light

A new form of radiation was discovered in 1895 by Wilhelm Roentgen, a German physicist. He called it X-radiation to denote its unknown nature. This mysterious radiation had the ability to pass through ... Continue reading

X-rays can be produced by a high-speed collision between an electron and a proton.

Neutrinos to the Rescue

Have you ever wondered what the most abundant particle in the universe is after photons of light? The answer is: Neutrinos. These tiny, neutral and almost mass-less particles that move at almost the ... Continue reading

Beta Decay