What are some of the types of electromagnetic radiation that is not “visible” to humans?
The portion of the EM spectrum that is visible to humans is the wavelengths between 400 and 750 angstroms. Any portion of the EM spectrum that lies beyond this region is not visible to humans. 2. How does electromagnetic theory explain the color “white”? black? White light is the combination of all wavelengths in the visible portion of the EM spectrum from 400 – 700 angstroms. Black light is the omission of these wavelengths. An object has a white “color” if it reflects all wavelengths. An object has a black “color” if it absorbs all wavelengths. An object will appear red in color if it reflects only wavelengths at the red end of the visible portion of the EM spectrum (650 – 700 angstroms) and absorbs all other wavelengths. 3. How does electromagnetic theory explain why exposure to x-rays is more dangerous than exposure to radio waves? X-rays have very short wavelengths, whereas radio waves have long wavelengths. Therefore x-rays transmit far more energy than radio waves and therefore
