A +8.00 uC enters midway into the electric field (100N/C) created by two oppositely charged horizontal plates (positive on top) placed 24.0 cm apart. If the charge (m=25.0mg) enters with a horizontal velocity of 15m/a right, find the horizontal distance that the charge travels before it strikes the negative plate.

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.

area of focus

the ima (higher than 1m) will be greater than the ima with the height of 1m.