13. 1 propose to study the relationship
between self-esteem and reading skill levels
among students at clairmont high school. at
clairmont, about 1 4 percent of the student
body are seniors, 24 percent are juniors, 30
percent are sophomores, and 32 percent are
freshmen. what kind of sampling approach
will i be most likely to use?

Acyclotron is used to produce a beam of high-energy deuterons that then collide with a target to produce radioactive isotopes for a medical procedure. deuterons are nuclei of deuterium, an isotope of hydrogen, consisting of one neutron and one proton, with total mass 3.34×10−27kg. the deuterons exit the cyclotron with a kinetic energy of 6.40 mev .a-what is the speed of the deuterons when they exit? b-if the magnetic field inside the cyclotron is 1.25 t, what is the diameter of the deuterons' largest orbit, just before they exit? c-if the beam current is 350 μa how many deuterons strike the target each second?