ASTRONOMY 105 Observational Astronomy Lab A Data Sheet 1 Name_________________________ Lab A: Measurements PROCEDURES A & B: Table 1 PROCEDURE C: Example A: (2.76 x 10 5 ) x (5.2 x 10 -2 ) = 14.352 x 10 5+(-2) = 14.352 x 10 3 = 1.4 x 10 4 (Note that the 5.2 x 10 -2 only has two significant digits. Hence the resulting calculation can only have two significant digits) 1. a. 2.0 x (2.8 x 10 5 ) = b. 5.6 x (6.725x10 -6 ) = c. (3.77x10 5 ) x (4.8x10 3 ) = d. (5.29x10 3 ) x (6.8x10 -7 ) = e. Y 3 x Y 5 = Number Scientific Notation Number of Significant Figures 206265 2356.46 6378 63.78 365.256366 1,215,800 3.1416 17.890 0.006214 0.15 ASTRONOMY 105 Observational Astronomy Lab A Data Sheet 2 Example B: 2.54 x 10 7 / 1.3 x 10 -2 = 1.95 x10 7-(-2) = 1.9x10 9 2. a. 9.65x10 3 / 2.0 = b. 5.6 x10 5 / 1.6 x 10 5 c. 3.2 x10 9 / 2.4 x 10 5 = d. 2.99792 x 10 8 / 5.520 x 10 -7 = e. (A 5 /A 3 ) 2 = PROCEDURE D: Number Log 2 1000 145 0.21 Table 2 PROCEDURE E: Width (centimeters) Length (centimeters) 1 2 3 Avg Table 3 ASTRONOMY 105 Observational Astronomy Lab A Data Sheet 3 Using the data from Table 3: 1. What is the number of significant digits in each average? _______ 2. What could be a source of error in the measurements? 3. Using the correct number of significant digits, what is the Average Width x the Average Length? ______________ A specific Astronomical equation can be solved to find the Absolute Magnitude ( M ) of a star. m - M = 5 log (d/10) If m = 4.8 and d = 1000, what is M ? PROCEDURE F: Graph the following values: Table 4 X Y 1.24 4.23 1.25 4.24 1.28 4.23 1.34 4.27 1.43 4.25 1.56 4.28 1.75 4.33 2.03 4.35 2.46 4.41 3.21 4.55 ASTRONOMY 105 Observational Astronomy Lab A Data Sheet 4 Graph Paper