A sun with an oval circling it and 13 lines extending from the sun to the oval line creating triangular shapes. Two of the triangles are highlighted, one on the top and one on the bottom. What must be true of the two highlighted triangles in the image? Check all that apply.

The speed of the planet is the same for both triangles.
The time frame is the same for both triangles.
The area is the same for both triangles.
The gravitational force is the same for both triangles.

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.

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