Use the graph to answer the questions. What is the half-life of isotope X? 25 seconds
How many radioactive atoms of isotope X are left after 3 half-lives? 13
How many half-lives must have occurred if only 7 atoms of isotope X are left? 4

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Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .

Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.