Asample of an unknown element was studies using photons with energy of 198.2 mj/mole. the kinetic energy of the ejected electrons was determined to be 38.6 mj/mole. what is the binding energy for these electrons?

Binding energy =159.6 MJ/mole

Explanation:

Given that

Photons energy = 198.2 MJ/mole

Kinetic energy of electrons = 38.6 MJ/mole

We know that the relationship between photons energy,kinetic energy of electron and binding energy

Photons energy = Binding energy + Kinetic energy of electrons

So

Binding energy = Photons energy - Kinetic energy of electrons

Now by putting the values

Binding energy =198.2 - 38.6 MJ/mole

Binding energy =159.6 MJ/mole

the answer would be c

1/0.14nm = 10^10/1.4 a lot