AST101H1 Lecture Notes - Lecture 12: Photosphere, Black Body, Radar Gun

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Eryan Apsnler, Michael Reid

Document Summary

Earth"s atmosphere blocks out specific colours from sunlight; particularly those in the. This lowers the sun"s spectrum from the yellow range to the red range. Light in the radio-visible range can reach earth"s surface. Uv and x-rays can go as far as 100 km above earth"s surface. Gamma rays can go as far as 10 km above the earth"s surface. Sun produces light across the entire em spectrum. This means that with differing telescopes, one can get a different view of the sun. E. g. with an infrared telescope, sun will appear orange (sunspots appear black); with an optical telescope, sun will appear white (sunspots remain black); with an x- Ray telescope, sun appears blue (areas of particularly great energy appear bright white); with a gamma ray telescope, sun appears green. An electron can change to lower energy levels by (randomly) emitting a photon of light that exactly corresponds to the energy change.