Recall the equation for FR
RF = distance travelled by /distance travelled by

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.