Galileo had some unique personality traits. he was highly curious and observant, had the courage to challenge authorities and preconceived notions, and always held truth over everything else. give evidence from his life to support this statement.

Galileo is one of the most revolutionary scientists in terms of the novelty of his ideas.

He made great advances in the laws of motion and astronomical matters, as well as the creation of telescopes, making the first observations of the Moon, Venus and Jupiter satellites.

He supported Copernicus's idea that the earth revolves around the sun, which was a controversial idea for his time, and the reason why his books were banned because the idea that the earth was not the center of the universe was not yet a well received idea.

For his ideas he was persecuted by the Inquisition and accused of heresy, but he was a proud man and stayed true to his ideas .

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.

15.3 cos 65 degrees trig