Philosophy: The Big Picture Unit 8 What is the BEST interpretation of the idea that “the truth of ideas must be assessed by observing how the ideas actually affect people”?

A. If you seek truth, you must first have a good idea.
B. There is no way to tell the truth about ideas until they fail.
C. Ideas cannot be evaluated until there is proof of their outcome.
D. Truth only exists in the realm of ideas and is not observable.

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.

god i hope this !