Graph the “number of nuclei in the sample” versus the “half-life number.” if the sample has 1/8 of the radioactive nuclei left, how many half-lives would the sample have gone through

Three half lives

Explanation:

The half life of a radioactive substance is the time taken for the substance to decay to half the original amount of radioactive material present in the sample.

Recall that radioactivity is the decay of a radioactive material releasing energy in the form of radiation.

After each half life, half of the original radioactive sample remains

Hence fraction of the substance left after three half lives is

N/No = (1/2)^3

Where N/No is the fraction of radioactive material left

N/No = 1/8

d. making up measurements to record.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.