This national public education campaign is designed to increase awareness among parents of children ages 8 to 12 about the causes and prevention of noise-induced hearing loss.
Our eyes are what allow us to see. Our eyes are designed to detect a small portion of the electromagnetic spectrum. This part of the spectrum is called the visible light region. The visible light region ranges in wavelengths from about 380 or 400 nm to 700 or 780 nm depending on which source is used. In fact it also depends on the sensitivity of a specific persons eyes.
The Photoelectric Effect. The focus in this course is on the interaction of electromagnetic waves (photons) with electrons to understand the creation and absorption of light. Electromagnetic waves have wavelengths that range from 1 nanometer (10-9 meter) for x-rays to 1 kilometer (103 meters) for radiowaves. Wavelengths of visible light are in the range of 400 to 700 nanometers (nm).