Saved Bookmarks
| 1. |
Find the energy eqivalent of one atomic mass unit, first in Joules and then in MeV. Using this express the mass defect of ""_8^16O in MeV//e^2. |
|
Answer» Solution :`1u = 1.6605 xx 10^(-27) kg` To CONVERT it into energy UNITS, we multiply it be `c^2` and FIND that energy equivalent `=1.6605 xx 10^(-27) xx (2.9979 xx 10^8) kg m^2//s^2 = 1.4924 xx 10^(-10)J` `= (1.4924 xx 10^(-10))/(1.602 xx 10^(-19)) eV = 0.9315 xx 10^9 eV = 931.5 MeV` Or, `1u = 931.5 MeV//c^2` For `""_8^16O, DeltaM = 0.1369 u = 0.13691 xx 931.5 MeV//c^2 = 127.5 MeV//c^2` The energy needed to SEPARATE `""_8^16O` into its constituents is thus `127.5 MeV//c^2`. |
|