Your cell phone is sitting on your desk, what kind of force is your desk exerting on your cell phone?

a force making it turn around and go to your hand

or as school says, an upwards force balancing out the force of gravity making it reach a state of equilibrium. I wasn't taught what that was called, but know it is an upwards force countering gravity so that your cell phone is in a balance state, and gravity isn't pulling it to the center of the earth.

Explanation:

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.

because growing process had stoped after 4-5 year