Hel A 0.2 kg red ball is thrown horizontally at a speed of 4 m/s from a height of 3 m. A 0.4 kg green ball is thrown horizontally from the same height at a speed of 8 m/s. Compared to the time it takes the red ball
to reach the ground, the time it takes the green ball to reach the ground is

you have to draw the persons position over there

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.

wavelegth as in spectrum red oygbiv