University Physics Volume 3

17th Edition
William Moebs + 1 other
ISBN: 9781938168185

University Physics Volume 3

17th Edition
William Moebs + 1 other
ISBN: 9781938168185
Textbook Problem

(a) Write the complete reaction equation for electron capture by 15O.

(b) Calculate the energy released.

To determine


The reaction equation for electron capture by 15O.



Electron capture is the process in which the protein-rich nucleus of an electrically neutral atom, absorbs on inner atom generally from K and L shell. This process changes a nuclear proton to nuclear neutron and causes the emission of an electron neutron. It is the most widely used method for deactivation and activation also an association of mass.

Interaction of an electron with nucleus through β- the decay process in the following the way,

  ZAx+e-Y+νe --------------------------------------- (A)

For nuclear capture, if n and m are atomic number and product is "s", then the relation is,

  n+m =s ---------------------------- (1)

IF p and q are mass of the reactant and "r" is the product, then the relation is,

  p+q = r ----------------------------- (2)

Oxygen's atomic number is 8 and that e- is 1.

Substitute n=8 and m=-1 in equation (1)

  8 – 1 = s

Therefore, s=7

New element formed is nitrogen,

The mass of the oxygen is 15 and that e is 0. Substitute p=15 and q=0 in equation (2)

  15 + 0 = r

Therefore, r = 15

To determine


The energy released in the β- process.

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