A1.2-cm-wide diffraction grating has 1000 slits. it is illuminated by light of wavelength 650 nm .what are the angles of the first two diffraction orders? express your answers using two significant figures separated by a comma.

To solve this problem it is necessary to apply the concepts related to destructive and constructive diffraction formulated in the bragg law.

It is understood by said law that,

where,

n = Any integer, representing the repetititon of the spectrum.

d = Width

It is the angle between the incident rays and the dispersion planes.

PART A) For a diffraction of first order n=1, then

PART B) For a diffraction of second order n=2, then

Therefore the angles of the first two diffraction orders are 3.1° and 6.2°

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.

i believe the answer is a hope it and is correct