Describe the appearance of each of the three types of spectra ...

[dollx]

Describe the appearance of each of the three types of spectra described by Kirchhoff's laws. Describe how each of the three types of spectra is formed.
 
  What will be an ideal response?

Question 2

Tycho Brahe's greatest contribution to astronomy was
 
  a. his model of the universe.
  b. his telescopic observations.
  c. his discovery of three laws of motion.
  d. his 20 years of careful observations of the planets.
  e. his model of the universe and his telescope observations.

[okolip]

Answer to Question 1

(1) A hot solid, liquid, or dense gas emits electromagnetic radiation at all wavelengths and produces a continuous spectrum.
(2) An excited, low-density gas produces an emission, or bright-line, spectrum containing emission lines.
(3) A light source viewed through a low-density gas produces an absorption, or dark-line, spectrum containing absorption lines.

Answer to Question 2

d