Define 1 amu. Calculate its energy equivalent in MeV.

Given that the oxidation state of sulphur is -2 , calculate the gram equivalent wt.of sulphur.

If the photon of the wavelength 150 pm strikes an atom and. one of its inner bound electrons is ejected out with a velocity of '1.5 xx 10^7 ms^(-1)'. Calculate the energy with which it is bound to the nuclëus.

The observed massof ""_(26)^(56)Fe is 55.9375 amu. Using the masses of proton and neutron as 1.00732 amu and 1.00866 amu respectively, calculate the binding energy per nucleon in joules

Naturally occuring boron has two isotopes of masses 10 amu and 11 amu. Calculate the percentage of each isotope if the average atomic mass of boron is 10.2 .