MHT-CET : Chemistry Entrance Exam

MHT - CET : Chemistry - Nuclear and Radiochemistry Formulae Page 1

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1.

 Dm= [ZmP+ (A - Z) mn] - M OR Dm= [ZmH+ (A - Z) mn] - M where, Dm= Mass defect in amu mP= Mass of proton in amu mn= Mass of neutron in amu mH= Mass of hydrogen atom A = Atomic number (number of protons) Z = Atomic mass number (number of protons and neutrons) M = Actual mass of the nucleus

2.

 B.E. = 931 × Dm MeV where, B.E. = Binding energy Dm = Mass defect in amu

3.

 B.E. per nucleon =

where,
B.E. = Binding energy
A = Atomic mass number

4.

 l = log

where,
l
= Decay constant in time -1
t = Time for the decay
N
o= Total number of radioactive atoms initially present (t= 0)
Nt= Total number of radioactive atoms present at time
t.

5.

 t1/2=

where,

t1/2= Half life period of the element
l = Decay constant

6.

 Atomic no. (Z) = Number of protons = Number of electrons

7.

 Atomic mass number (A) = Atomic number (Z) + Neutron number (N)

8.

Some Important Conversions

 i. 1 amu = 1.658 × 10-24g = 1.658 × 10-27 kg ii. 1 MeV = 106 eV = 1.603 × 10-13 J iii. 1eV = 1.603 × 10-19 J

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