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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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