A student has 29 apples in a basket. She weighs the apples and records the masses in the graph below A- between 0.10kg and 0.12kg
B- between 0.12kg and 0.14kg
C-between 0.14kg and 0.16kg
D- between 0.16kg and 0.18kg

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?