Evidence that the cosmic background radiation is the remnant of a Big Bang comes from predicting characteristics of remnant radiation from the Big Bang theory and comparing these predictions with observations.
Four of the five statements below are real. Which one is fictitious?
A) The cosmic background radiation is expected to have a temperature just a few degrees above absolute zero, and its actual temperature turns out to be 2.73 K.
B) The cosmic background radiation is expected to have tiny temperature fluctuations at the level of about 1 part in 100,000. Such fluctuations were found in the COBE data.
C) The cosmic background radiation is expected to look essentially the same in all directions, and it does.
D) The cosmic background radiation is expected to contain redshifted emission lines from hydrogen and helium, and it does.
E) The cosmic background radiation is expected to have a perfect thermal spectrum, and observations from the COBE spacecraft verify this prediction.
Question 2
Consider the star to which the arrow points. Which of the following statements about this star is not true?
A) Its surface temperature is lower than the Sun's.
B) Its core temperature is higher than the Sun's.
C) It is larger in radius than the Sun.
D) It is brighter than the Sun.
E) It is significantly less massive than the Sun.
Photosynthetically active radiation (PAR) diminishes substantially with passage through the canopy o
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