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CHAPTER 1 - 1

# CHAPTER 1 - 1 - ,Measurement,Estimating 1(a ,wehave...

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CHAPTER 1 - Introduction, Measurement, Estimating 1. ( a ) Assuming one significant figure, we have 10 billion yr = 10 × 10 9  yr =            1 × 10 10  yr ( b ) (1 × 10 10   yr)(3 × 10 7  s/yr) =         3 × 10 17  s . 2. ( a ) 4 significant figures . ( b ) Because the zero is not needed for placement, we have         4 significant figures . ( c ) 3 significant figures . ( d ) Because the zeros are for placement only, we have         1 significant figure . ( e ) Because the zeros are for placement only, we have         2 significant figures . ( f ) 4 significant figures . ( g ) 2, 3, or 4 significant figures , depending on the significance of the zeros. 3. ( a ) 1,156 =         1.156 × 10 3 . ( b ) 21.8 =         2.18 × 10 1 . ( c ) 0.0068 =          6.8 × 10 –3 . ( d ) 27.635 =         2.7635 × 10 1 . ( e ) 0.219 =         2.19 × 10 –1 . ( f ) 22 =         2.2 × 10 1 .

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