ASTR 107 Lecture Notes - Lecture 3: Electromagnetic Spectrum, Electric Field
Document Summary
The visible light spectrum exists between uv (ultra violet) light and ir (infrared) light (between. Visible spectrum is only a small part of the full electromagnetic spectrum. Frequency: number of waves that pass by each second. A long wavelength means low frequency, a short wavelength means high frequency. All em (electromagnetic) waves travel at the speed of light. E(cid:374)ergy is (cid:858)i(cid:374)(cid:448)ersely proportio(cid:374)al(cid:859) to (cid:449)a(cid:448)ele(cid:374)gth: or e(cid:374)ergy is (cid:858)dire(cid:272)tly proportio(cid:374)al(cid:859) to frequency. The primary colors of light are red, blue, and green. Most of the popular hubble images are made by combining a red image, a green image, and a blue image. Because of the way our eyes work almost any color can be simulated by combining the three primary colors of light, all colors combined make white light. Light is a wave of combined electricity and magnetism call an electromagnetic wave. Changing electric and magnetic field create a self-sustaining electromagnetic wave.
