Nuclear Reactions

If a 1.50-cm-thick piece of lead can absorb 90% of the rays from a radioactive source, how many centimeters of lead are needed to absorb all but 0.100% of the rays?

PHYC101 Week 1 Science: Process of Model Building Physical (concrete; 3D objects) Gestural (kinesthetic; body movements) Verbal (spoken/written; analogy; metaphor) Pictorial (visual diagrams; animations) Numerical (data table; lists) Graphical (ordered pairs) Mathematical (equations, formulas) The Metirc System Meters o Measures length or distance Millimeter o Thickness of a dime Centimeter o Width of a paperclip o fingernail Kilometer o 10 football fields o 6 city blocks o used to measure mass or weight Milligram o Grain of salt Grams o Small as a paperclip Kilograms o 6 apples/ 2 pounds Liters o Measures liquids or capacity Milliliter o One drop Changing Metric Units To change from one unit to another, multiply or divide by 10 Time 1m = 60 sec 1hr = 60min = 3600 sec Verbal Model Common words and phrases used to describe the motion of an object in a straight line o (One dimensional motion) Speeding up; slowing down Constant speed; constant velocity Accelerating; decelerating Distance; displacement Proper use of these terms in scientific sentence could be different from real life