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Physics
mp and mn are masses of proton and neutron respectively. An element of mass M has Z protons and N neutrons then
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Q. $ m_p $ and $ m_n $ are masses of proton and neutron respectively. An element of mass $ M $ has $ Z $ protons and $ N $ neutrons then
MHT CET
MHT CET 2007
Atoms
A
$ M > Zm_p + Nm_n $
12%
B
$ M = Zm_p + Nm_n $
35%
C
$ M < Zm_p + Nm_n $
23%
D
M may be greater than less than or equal to $ Zm_p + Nm_n $ , depending on nature of element
30%
Solution:
When a nucleus is formed, then the mass of nucleus is slightly less than the sum of the mass of $Z$ protons and $N$ neutrons. ie $M < (Zm_p+Nm_n)$