SME
Grade 12 Science
Light, spectra, telescopes and distances to stars
The main lesson, then each kind of problem it solves.
Light, spectra, telescopes and distances to stars
Main lesson
A star’s Doppler shift
Use this for “A star’s Hα line is seen at 656.5 nm. How fast is it moving, and which way?”
A telescope’s magnification and light-gathering
Use this for “A telescope has a 900 mm objective and a 25 mm eyepiece. What is its magnification?”
Distance from parallax
Use this for “A star’s parallax is 0.1″. How far away is it, in parsecs and light-years?”
Matching a star’s lines to elements
Use this for “Which elements are in this star?” from its dark lines and lab spectra.
From the ground or only from space?
Use this for “Why must X-ray telescopes be put in space?”