Chapter 28, Problem 27Q

To determine

Why do we not expect perfect agreement between measured values and the calculated values of X-rays using Bohr model.

Answer to Problem 27Q

Solution:

We cannot observe a perfect agreement between the observed and calculated values of x-ray due to the shielding effect of electrons.

Explanation of Solution

There will be a deviation for the x-ray wavelengths if we use the Bohr model to calculate the values. It is because of the shielding effect of the electrons present in the atom. Therefore, in calculations, instead of $z$ we have to use $z-1$ as the number of electrons.