3. A projectile is fired up an incline (incline angle º) with an initial speed v, at an angle 0, with respect to the horizontal (0> 0) as shown in ??. (a) Show that the projectile travels a distance d up the incline, where 2 v cos e sin(0- ) d= g cos 0 (b) For what value of 0; is d a maximum, and what is that maximum value? Path of the projectile ya d 16 Figure 2: ASIWO3​

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.