Archive for the 'Physics' Category

“Whoa, there’s colors!”

Wednesday, January 31st, 2018

PhyiscsGirl: Can you see this type of light? (YouTube, 9:45min) “Polarized light is an unusual form of light. Can humans see when light is polarized?”

By the way, you can train yourself into seeing the polarization of light. The video mentions staring at a lcd screen for a while and tilting your head to see Haidinger’s brush. You can do the same thing with the sky on a clear day. After practicing this for a bit, you’ll be able to detect the polarization of the sunlight easier and easier.

Auf deutsch heißt das Phänomen übrigens Haidinger-Büschel.

From CRT to OLEDs

Tuesday, January 23rd, 2018

The Slow Mo Guys: How a TV Works in Slow Motion. (YouTube, 11:38min)

“If you are reading this, you’ve seen a screen with your eyes. But have you REALLY seen it though? Like real proper seen it? Don’t worry, Gav is here to help you out. This is How a TV works in Slow Motion.”

Link via MetaFilter.

Eeee-heeeee-heeeeeeee… Crack!

Friday, January 19th, 2018

Physics Girl: How I broke a wine glass with my voice (using science!) “If you sing at a wine glass at its exact resonant frequency, you can break the glass without the help of a speaker! Learn the physics behind that.”

“At 13 billion miles from Earth, there’s no mechanic shop nearby to get a tune-up.”

Monday, December 4th, 2017

JPL CalTech: Voyager 1 Fires Up Thrusters After 37 Years

Voyager 1, NASA’s farthest and fastest spacecraft, is the only human-made object in interstellar space, the environment between the stars. The spacecraft, which has been flying for 40 years, relies on small devices called thrusters to orient itself so it can communicate with Earth. These thrusters fire in tiny pulses, or “puffs,” lasting mere milliseconds, to subtly rotate the spacecraft so that its antenna points at our planet. Now, the Voyager team is able to use a set of four backup thrusters, dormant since 1980.

“With these thrusters that are still functional after 37 years without use, we will be able to extend the life of the Voyager 1 spacecraft by two to three years,” said Suzanne Dodd, project manager for Voyager at NASA’s Jet Propulsion Laboratory, Pasadena, California.”

Link via MetaFilter.

Some eye candy: Voyager Images from the Odysseys (NASA Space Photos) (YouTube, 2:48min)

Ka-boom!

Saturday, December 2nd, 2017

NPR Here and Now: 75 Years Ago, Scientists Conducted An Unprecedented Nuclear Experiment.

“Seventy-five years ago this week, scientists from the University of Chicago created the first controlled, self-sustained nuclear chain reaction, a feat that was essential in the development of an atomic bomb during World War II.

Enrico Fermi and his team of physicists secretly conducted the Chicago Pile 1 experiment on a squash court under the stands of a football stadium on Dec. 2, 1942. The anniversary of this unprecedented achievement comes as tensions escalate between the U.S. and North Korea, which launched a new ballistic missile on Tuesday.”