Light of wavelength 500 nm falls normally on 50 slits that are 3.9 ✕ 10−3 mm wide and spaced 3.51 ✕ 10−2 mm apart. How many constructive interference fringes lie in the central peak of the diffraction pattern? (Round your answer to the nearest integer.)

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.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle