To begin your activity, open this tracker experiment: Snowboard Jump Energy. Watch the movie by clicking on the play button. (The other video controls allow you to “rewind” the video or step forward or backward one frame at a time.) Observe the video and answer the following questions.

Part A
What can you say about the snowboarder’s kinetic energy as he moves?

Part B
Similarly, what can you say about the potential energy of the snowboarder?

Part C
Based on your observations, what can you say about your prediction in Parts A and B above concerning the potential and kinetic energy?

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.

this means that the temperature of both substances will be equal