An absorption spectrum of oxygen is shown below.

A rainbow for a line spectra from purple through red. There are 5 black lines in purple, 6 black lines in blue, 3 black lines in blue-green, 3 black lines in the green, 6 black lines in the orange and 5 black lines in red.

What is most likely the emission spectrum of oxygen?

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?