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 2.45 ⋅ 105 seconds? (5 points) part b: which is the more reasonable measurement of the diameter of a blood cell: 7.4 ⋅ 10−3 mm or 7.4 ⋅ 103 mm? justify your answer. (5 points) asap

A) 9.56x10^38 ergs b) 7.4x10^-3 mm a). for the sun, just multiply the power by time, so 3.9x10^33 erg/sec * 2.45x10^5 sec = 9.56x10^38 b) of the two values 7.4x10^-3 and 7.4x10^3, the value 7.4x10^-3 is far more reasonable as a measurement for blood cell. reason becomes quite evident if you take the 7.4x10^3 value and convert to a non-scientific notation value. since the exponent is positive, shift the decimal point to the right. so 7.4x10^3 mm = 7400 mm, or in easier to understand terms, over 7 meters. that is way too large for a blood cell when you consider that you need a microscope to see one. now the 7.4x10^-3 mm value converts to 0.0074 mm which is quite small and would a reasonable size for a blood cell.