Assuming an ionization efficiency of 53.0 % , how many such photons are needed to ionize 1.00 × 10 16 atoms?

This is an incomplete question, here is a complete question.

The first ionization energy of a carbon atom is 1.81 aJ (attojoules).

Assuming an ionization efficiency of 53.0 %, how many such photons are needed to ionize 1.00 × 10¹⁶ atoms?

Answer : The number of photons needed to ionize 1.00 × 10¹⁶ atoms are,

Explanation : Given,

Energy =

First we have to calculate the energy required to ionize the atom.

Energy required to ionize the atom =

Energy required to ionize the atom =

Energy required to ionize the atom =

Now we have to calculate the number of photons are needed to ionize 1.00 × 10¹⁶ atoms.

Thus, the number of photons needed to ionize 1.00 × 10¹⁶ atoms are,

the answer your looking for is c).