An astronomer records over several nights the change in position of Venus and then calculates that Venus orbits the Sun once every 110 Earth days. This figure is considerably lower than the 225 Earth-day orbit that is widely accepted for Venus. What should the astronomer do next?
O publish the findings to reveal the flaw in current orbital theories
o gather a new set of data and see if the results remain the same
add 115 days to the calculations to match the current published data
o form a hypothesis to explain how the orbit of Venus can vary so greatly

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.

uranium fissions/breaks up giving out energy and neutrons

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.