1) how old is a bone in which the carbon-14 in it has undergone 8 half-lives?
select one:
a. 45600
b. 91200
c. 91200
d. 11400
2) in the process of radiocarbon dating, the fixed period of radioactive decay used to determine age is called the
select one:
a. exponent.
b. half-life.
c. isotope.
d. nucleus.
3) a certain byproduct in nuclear reactors, 210po, decays to become 206pb. after a time period of about 276 days, only about 25% of an original sample of 210po remains. the remainder has decayed to 206pb. determine the approximate half-life of 210po.
select one:
a. 138 days
b. 276 days
c. 414 days
d. 552 days

Particles vibrate in a rigid structure and do not move relative to their neighbors.

Suppose you wanted to make 100 grams of water. what is the molar mass of water (h2o)?

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent