X Rays And The Ordering Of The Elements

Step 1: Use the Bragg's law.
Bragg’s law for diffraction is given by where is the diffraction order, is the wavelength, is the distance between the planes, and is the diffraction angle. Step 2: Calculate the distance between planes.
The lattice parameter and for the planes, Step 3: Apply Bragg’s law for maximum diffraction order.
For the highest order diffraction, , so Substitute the values and : Thus, the highest integer is 56. Final Answer: The highest order present in the diffraction pattern is

Step 1: Use the Rydberg formula for X-ray wavelengths.
The characteristic K X-ray wavelength for an atom can be calculated using the formula: where For the K transition, and , so Step 2: Simplify and calculate the wavelength.
First, calculate the numerator: Now, calculate the denominator: Thus, Converting to nanometers: Final Answer: The wavelength of K X-ray photons from Mo is