Rank these times based on the wavelength of the peak intensity of ...

[kellyjaisingh]

Rank these times based on the wavelength of the peak intensity of the cosmic background radiation at those times, from shortest to longest. (Hint: consider how the temperature of the universe or the cosmic background radiation changed with time.)
 
  A) today, 1 million years after the Big Bang, 100 million years after the Big Bang
  B) 100 million years after the Big Bang, 1 million years after the Big Bang, today
  C) today, 100 million years after the Big Bang, 1 million years after the Big Bang
  D) 1 million years after the Big Bang, 100 million years after the Big Bang, today

Question 2

All of the following hypothetical planets orbit a star with the same mass as the Sun (one solar mass).
 
  Which one has the shortest orbital period? (If two objects would have the same orbital period to within a difference of less than 1 consider them as having identical periods.)
  A) Planet A: one Earth mass and 1 AU from the star
  B) Planet B: two Earth masses and 1 AU from the star
  C) Planet C: two Earth masses and 2 AU from the star
  D) Planets A and B
  E) Planets B and C
  F) All of them have the same period.

[juiceman1987]

Answer to Question 1

D

Answer to Question 2

D

[kellyjaisingh]

Thanks

[juiceman1987]

Welcome