AST201H5 Lecture Notes - Lecture 11: Blueshift, Radiography
Document Summary
Yesterday"s class: homework 2 due this thursday, model of the atom as a mini solar system fails bc an accelerating charge (e ) loses energy, spiral into the nucleus, second atomic model: only certain e obits are allowed, absorption of certain wavelengths= energy to raise electron, emission of certain wavelengths= energy released when electron return to a lower level, each element has its own number of e (cid:224) own unique pattern, molecules and ions each have different patterns, doppler effect= spectral pattern shifted by radial motion: motion apart(cid:224) redshift, motion toward(cid:224) blueshift, telescopes= larger pupils to gather more light from faint astronomical objects. The gain of telescopes: a telescope gives us a bigger pupil, gain= area of telescope/area of pupil (related to the diameter)= (telescope diameter/pupil diameter)^2 (the pi and 4 cancel out, largest telescope"s diameter= 10. 4 m or 10,400 mm (to be consistent with measurement of pupil) (cid:224) gain= (10,4000 mm/7mm)^2.
