How does the speed of light depend on an observer's frame of reference? a. the speed of light is faster when observed from a frame of reference that is not moving b. the speed of light is the same regardless of the frame of reference c. the speed of light is slower when observed from a frame of reference that moves close to the speed of light d. the speed of light depends on the acceleration of the frame of reference

The speed of light is the same in all frames of reference, regardless of the frame of reference or how it's moving.

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.

the answer is b

explanation: