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hetto yo wy A (cS First Semester 2007-08 Prof. Cohn Section 14192 Astronomy 105, Study Problems #1 The questions given below are examples of the type of subject material that you will be expected to know for your exam on Thurs., Sept. 20. The exam will not go beyond the point reached in class on Tues., Sept. 18. The exam will consist of 50 multiple-choice questions, Please note that there will be topics on the exam that are nor covered by the questions given below. 1. Express the following numbers in scientific notation: (a) 673,948,000 (b) 84,261 ,000,000,000 (©) 9,241,000,000 Answer: (a) 6.73948 x 108 (b) 8.4261 x 1013 (c) 9.241 x 10° 2. Express the following in common notation (with zeros): (a) 1,90 x 1027 (mass of Jupiter in kg) (b) 3.16 x 107 (number of seconds in a year) (c) 9.46 x 10!? (number of km in | light year} Answer: (a) 1,900,000,000,000,000,000,000,000,000 (6) 31,600,000 (c) 9,460,000,000,000 3. Express the following numbers in scientific notation: (a) 0.000001 (wavelength of near infrared radiation in m) (b) 0.00000035 (wavelength of near ultraviolet radiation in m) (©) 0.00000000000000000000000000167 (mass of proton in kg) Answer: (a) 10-6 (b) 3.5x 1077 (©) 1.67 x 10-27 
