Part A: The sun produces 4.2 ⋅ 1036 ergs of radiant energy per second. How many ergs of radiant energy does the sun produce in 2.12 ⋅ 107 seconds? Show your work. (5 points) Part B: Which is the more reasonable measurement of the diameter of a human hair: 2.3 ⋅ 10−2 mm or 2.3 ⋅ 102 mm? Justify your answer. (5 points)