Abeam of z-polarized atoms with angular momentum quantum numbers 1 「and m- 0 passes between the poles of two stern-gerlach magnets one after the other. the first magnet is oriented in the r direction and the second in the z direction. all beams emerging from the first magnet pass between the poles of the second. (a) how many beams emerge from the second magnet? explain. (b) what are the polarizations (angular momentum quantum numbers) of those beams and what fraction of the incoming atoms emerge in each beam?

b) phosphorus pentoxide

it is the second option.

answer: the correct answer is 1.

explanation: there are various process in which a radioactive nuclei decays:

1) alpha decay: in this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. the mass number is reduced by 4 units.

2) electron capture: in this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. simply, a proton and an electron combines together to form a neutron. mass number does not change in this process.

3) gamma ray emission: it is a decay process in which an unstable nuclei gives excess energy by a spontaneous electromagnetic process. this decay releases . this process does not change the mass number.

4) positron emission: it is a type of decay process, in which a proton gets converted to neutron and an electron neutrino. this is also known as -decay. in this the mass number remains same.

from the above information, we see that only alpha-decay is producing a change in the mass number of the nucleus.