NATS 1945 Study Guide - Quiz Guide: Phosphorescence, Bioluminescence, Sunburn

• School: York University
• Department: Natural Science
• Course: NATS 1945
• Professor: Robin Metcalfe

Document Summary

Black lights emit most of their light waves just outside the range humans can perceive, in the ultraviolet part of the spectrum. Fluorescent absorbs uv and immediately re-emit at visible spectrum. Phosphorescent re-emit visible light over several hours. Uvc is shortest, uva is the longest wavelength. Uva and uvb can pass the atmosphere. Uv index measures intensity of uv sunlight during the day. Formed by ultraviolet atoms of the sun. Chemicals that can absorb heat and spray cans. Thinning of the ozone layer over antarctica. Bones readily absorb x-rays and produce high contrast on the x-ray detector. As a result, bony structures appear whiter than other tissues against the black background of a radiograph. A computed tomography (ct) scan is a noninvasive diagnostic test that uses x-rays and a computer to create images of the body: explain the role of gamma rays and antimatter in a pet scan.