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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Atoms Molecules and Nuclei Page 6

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Units of Radioactivity

 

Activity (A) of a radioactive sample is the number of disintegrations occurring per unit time,

A =

|

dN

| = Nl

 

dt


Curie: The activity of a radioactive sample is said to be one curie (1 ci)
if 3.7 1010 disintegrations occur per second.

Other unit: The SI unit : bequerel (Bq)

  1. 1 Bq = 1 disintegration/S.
  2. 1 rutherford (rd) = 106 disintegration/S.

 

 

9.

Mass and Energy Relation

 

According to Einstein's special theory of relativity

  1. Variation of mass of a body with its speed is given by

m =

m0

 

  1.  

where m0

= mass of particle when it is at rest

n

= velocity of particle

c

= velocity of light

  1.  
  2. Energy and mass are equivalent and related by the equation

E

= mc2

\ E

=

m0c2

 

\ E

= m0c2 + k

where m0c2

= rest energy of particle

k

= kinetic energy of particle.

 




 

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