Part A: The sun produces 3.9 ⋅ 1033 ergs of radiant energy per second. How many ergs of radiant energy does the sun produce in 1.55 ⋅ 107 seconds? (5 points) Part B: Which is the more reasonable measurement of the diameter of a human hair: 1.8 ⋅ 10−2 mm or 1.8 ⋅ 102 mm? Justify your answer.