Waves, Sound, Light

Resources

Skyglow from a city and highway

Light Pollution

Light can be a type of pollution. Learn about the damage it causes to people and living things as well as how you can prevent it.
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Light Pollution

Adult and children looking through telescope

The Optics of Telescopes

Learn about telescopes, how they work & why they're important to astronomers.
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The Optics of Telescopes

Boy looking through telescope at night

Optical Telescopes

Learn about the history of telescopes and the function of refracting and reflecting optical telescopes.
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Optical Telescopes

Large diamond refracting light

Reflection and Refraction

Learn about reflection and refraction and meet Emily Altiere, a PhD student in physics who studies lasers.
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Reflection and Refraction

Abstract light pattern

Light and Its Properties

Learn about light and its properties.
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Light and Its Properties

Ultrasound treatment on knee

Ultrasonography

Learn about the history, function, uses, benefits and risks of Ultrasonography as a medical imaging technology.
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Ultrasonography

hermographic image a woman’s head and neck

Thermal Imaging

Learn about uses of thermal imaging as a medical imaging technology.
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Thermal Imaging

dental x-ray

Radiography & X-ray Imaging

Learn about radiography and x-rays as a form of medical imaging technology.
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Radiography & X-ray Imaging

Gamma ray image of the Milky Way taken by NASA’s Fermi Gamma Ray Space Telescope (NASA)

Gamma Rays: Helper or Hazard?

Gamma rays might make you think of cancer, harmful radiation or superheroes. But gamma rays have lots of uses: food safety, manufacturing and even medicine!
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Gamma Rays: Helper or Hazard?

 Sound waves and sound-producing devices. Image © jop_pop, istockphoto.com

Sound vs. Noise

What is the difference between sound and noise? How do they affect your hearing? And is noise always a bad thing?
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Sound vs. Noise

A pot of gold at the end of a rainbow

What's in a Rainbow?

Rainbows are beautiful examples of optics in nature. We see them thanks to the reflection and refraction of visible light and water.
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What's in a Rainbow?

woman with camera

Eye vs. Camera

The human eye lets us see the world by sending impulses to our nervous system. In many ways, it is very similar to other optical devices, including cameras.
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Eye vs. Camera

​​​​​​​The Electronic Sackbut Synthesizer

Who Created the Electronic Synthesizer?

A Canadian researcher built the first voltage-controlled synthesizer in the 1940s.
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Who Created the Electronic Synthesizer?

Radiation shielding garment on the International Space Station

Radiation and Human Space Exploration

One of the greatest hazards that humans in space face is cosmic radiation. Learn what cosmic radiation is, why it's dangerous, and ways that we are looking at protecting humans in deep space.
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Radiation and Human Space Exploration