Light waves, visible and invisible - Lucianne Walkowicz

Each kind of light has a unique wavelength, but human eyes can only perceive a tiny slice of the full spectrum -- the very narrow range from red to violet. Microwaves, radio waves, x-rays and more are hiding, invisible, just beyond our perception. Lucianne Walkowicz shows us the waves we can't see.

 Lesson by Lucianne Walkowicz, animation by Pew36 Animation Studios.

 

MIT 8.02 Electricity and Magnetism Lecture 28

Index of Refraction, Poynting Vector, Oscillating Charges, Radiation Pressure, Comet Tails, Polarization (Linear, Elliptical, and Circular).

 

MIT 8.02 Electricity and Magnetism Lecture 27

MIT 8.02 Electricity and Magnetism, Spring 2002

Professor Walter Lewin

Resonance; Destructive Resonance; Electromagnetic Waves; Speed of Light; Radio - TV; Distance Determinations using Radar and Lasers

Other lectures from the same course


 

The Story of Electricity 3

Shock and Awe - The Story of Electricity. Revelations and Revolutions: electromagnetic waves, radio communications, semiconductors, Crookes tube and the discovery of the electron, transistor, supraconductivity.



Previous episodes:   1 and 2.

ScienceCasts: The Sound of Earthsong

A NASA spacecraft has recorded eerie-sounding radio emissions coming from our own planet. These beautiful "songs of Earth" could, ironically, be responsible for the proliferation of deadly electrons in the Van Allen Belts.

   

IDTIMWYTIM: Radiation

Hank explains the whole story about radiation - the good, the extremely helpful, and the bad.

Other Sci-Show videos

Microwave Fabry-Perot interferometer

Microwaves are a form of electromagnetic wave, just as visible light is. Being a way, it can experience interference, just as light can, but having a wavelength on the order of an inch long, in this demonstration, it is much easier to observe the interference. In this video, we see how a Fabry-Perot interferometer works.

 

Weekend Projects - Bottle Radio

Crystal radio technology has been around for many years. This "bottle radio" take on a crystal radio requires no power source, operates on the power from radio waves, and receives signal from a long wire antenna. As radio stations slowly move away from the AM band, the "window of opportunity" to experience this remarkable technology is dwindling. The "crystal" in question is contained inside a germanium diode, and is used to rectify the radio signal so that our ears can hear it.

 

Science off the Sphere: Earth in Infrared

Don takes advantage of the view aboard the International Space Station and takes some amazing infrared photgraphs.

Other Science off the Sphere videos

Frequency modulation - Part 1 - Basic Principles

Department of Defense 1964. Fundamentals of AM and FM radio communication, how FM eliminates problem of electrical interference, functioning of FM radio examined in detail.

 

Polarisation - Sixty Symbols

The strange world of electromagnetic waves!

Other Sixty Symbols videos

There is no pink light

Pink doesn't exist!

Other Minute Physics videos

Antenna - Sixty Symbols

Bet you never knew antennas (or aerials) could be so interesting!

Other Sixty Symbols videos

How Damaging is Radiation?

What is radiation? Are all types harmful? What are the most common sources of damaging radiation? Most people view radiation as harmful and negative without understanding what makes it potentially damaging and which forms should be avoided. For example, many felt radiation from mobile phones probably caused cancer but few focused on the carcinogenic effects of UV rays.

Other Veritasium videos

Afterschool Universe: Infrared Detection Circuit

Constructing a simple infrared detection circuit.

Other Afterschool Universe videos

Transparency and Opacity

A material that is transparent in one part of the spectrum may be opaque in another. Here, we see normal window glass is transparent to visible light (obviously) but opaque to the thermal infrared, as shown by an infrared camera. Similarly, a garbage bag blocks visible light but passes infrared.

Eureka! Episode 30 - Radiation Spectrum

Viewers learn that the waves of heat energy radiated by the sun come in many forms, which together make a band, or spectrum, of energy waves.

Other Eureka episodes

Faraday's Law: Levitator

This Apparatus is a magnetic levitator, illustrating Lenz's law. The levitator can support an aluminum bowl about a foot in mid air in stable equilibrium.

Eureka! Episode 29 - Radiation Waves

Viewers learn that one of the chief ways in which heat energy moves is in the form of waves. This kind of heat transfer is called radiation.

Other Eureka episodes

A Color You Can't See

How can you see a color that you can't see? Use your cell phone.

Source: The Happy Scentist

Other videos by Robert Krampf