Suppose a light ray is changing direction when it changes from one transparent medium to another. which of the following changes would make it change direction even more, to make a path with a greater angle to its original path? (select all that apply) a. change to a higher frequency of light b. move the incident ray to take a direction closer to perpendicular to the interface (closer to the normal line) c. change the second medium to get a greater difference than before in the speed of light in the two mediums d. make the light ray wider

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.

it would be kevlar ^^