1.

Explain nuclear mass defect.

Answer»

We have read that the entire mass of the atom and positive charge is concentrated in the nucleus and nucleus is composed by the protons and neutrons. We also know how much protons and neutrons occur in the nucleus therefore, the expected mass of a nucleus can be determined by the calculation. The actual mass of nucleus can also be determined by mass spectrograph. It is found that the actual mass of any nucleus is always less than the expected mass obtained by its nucleons calculation. This difference of mass is called mass defect. Similarly,
Mass defect = Mass of nucleus obtained by the calculation — Actual mass of nucleus
or Δm = mc – ma
Where calculated mass is represented by mc and actual mass is represented by ma.
∴ Δm = [Mass of protons + mass of neutrons] – Actual mass of nucleus
or Δm = [Zmp +(A – Z) mn] – m …………… (1)
Where Z is atomic number, A’mass number, mp mass of proton, mn mass of neutron and m is the actual mass.


Discussion

No Comment Found

Related InterviewSolutions