Which safety procedure should you follow after breaking a mercury thermometer?
a. sweep the mercury into a dust pan and throw it into the trash can.
b. move away from the mercury and notify the teacher.
c. rinse the counter with water and wash the mercury into the sink.
d. use a napkin to pick up the broken glass and mercury.

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?