I must still have an old incident light meter lying around; I'll see how different my results are when I put its milky white dome in front of my phone camera. Color and spectrum are different ...

The electromagnetic spectrum, or EM spectrum ... at the same speed in the vacuum of space, the speed of light, or about 300 million meters per second (300,000 km/s). Each type of EM radiation ...

The sunlight that we see — aptly named visible light — falls into only a very narrow range of the spectrum, from about 400 to 750 nanometers (a nanometer is one-billionth of a meter ...

On the left, in image (a), you see the Whirlpool in the visible light spectrum, at 0.4 microns ... with the Kitt Peak National Observatory 2.1-meter (6.8-foot) telescope. The dark swirls you ...

WiPry spectrum analyzer/RF power meter for iPad, iPhone, and iPod Touch. Oscium, www.oscium.com. Oscium, the company that developed an iOS oscilloscope, has added a spectrum analyzer/power meter for ...