science
posted by Angie .
Which statement best explains why dating geologic materials from the Quarternary Period uses a different radioactive isotope than for materials from the cambrian Period?
a. all rocks contain radioactive substances.
b. some isotopes decay faster than others.
c. not all isotopes form stable decay products
d. the decay of atoms occurs as a random event
i think it's b..
Respond to this Question
Similar Questions

science
Hello! I need help with some Science things. 1. Where is a good place to find a picture that describes radioactive decay, fussion and fission/ 4. Scientists use the amount of radioactive isotopes found in rocks and fossils to calculate … 
Geology
Does this sound right? Describe your assigned method and how it is used to evaluate geologic time. My assigned method was Absolute Dating / Numerical Age. Absolute Dating / Numerical Age is the process that assigns a numerical age 
Chemistry
How many half lives will it take for a sample of a radioactive isotope containing 20000 radioactive nuclei to decay to 2000 radioactive nuclei 
Differential Equations
Model radioactive decay using the notation t = time (independent variable) r(t) = amount of particular radioactive isotope present at time t (dependent variable) λ = decay rate (parameter) Note that the minus sign is used so … 
science
A 10g sample of radioactive substances is lift to decay for five halflives. How much of the radioactive substance remains? 
Science Radioactive Dating
Which of the following statements about radioactive dating is true? 
Science
What process involves the comparison of rock layers with others in a sequence to determine its age? 
Algebra
Two different radioactive isotopes decay to 10% of their respective original amounts. Isotope A does this is 33 days, while isotope B does this in 43 days. What is the approximate difference in the halflives of the isotopes? 
chemistry
Situation: You have 100ml of isotopically labelled water 3H2o. That is, the water is made with the radioactive isotope of hydrogen, tritium, 3H. Compounds that contain radioactive isotopes are called "hot." You pour this 100 mL of … 
Calculus
The rate of decay is proportional to the mass for radioactive material. For a certain radioactive isotope, this rate of decay is given by the differential equation dm/dt = .022m, where m is the mass of the isotope in mg and t is the …