As the Sun evolves into a red giant in the distant future, then ...

[jeatrice]

As the Sun evolves into a red giant in the distant future, then according to Wien's Law:
 
  A) most of its energy must become shorter in wavelength.
  B) its peak on the Planck curve will move into the infrared.
  C) its total luminosity must decrease.
  D) it will disappear from the universe of visible light.
  E) its light will be slowed down by its increasing mass.

Question 2

What is spectroscopy?
 
  A) An analysis of the way in which atoms absorb and emit light
  B) A study of the geometry of rainbows
  C) An observational technique to measure the brightness of light at different colors
  D) The use of CCDs to capture light more efficiently than with photographic film
  E) A method to freeze atmospheric turbulence for better resolution

[sabina576]

Answer to Question 1

B

Answer to Question 2

A