Describe with the aid of diagrams how the free electron dispersion relation is modified by the presence of a periodic potential. [10] (b) a monovalent metal consists of a simple cubic lattice of atoms with spacing a. calculate the radius of the fermi sphere in terms of a. express this as a fraction of the distance to the first brillouin zone boundary. could this metal be said to be a free electron metal?

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.

small = small current large mag large current

unbalanced force

explanation:

where’s the list ? the question is incomplete