Use Moseley’s law with b = 1 to find the frequency of the K_α X-ray of La (Z = 57) if the frequency of the K_α X-ray of Cu (Z = 29) is known to be 1.88 × 10¹⁶ Hz.

A certain element emits K_α X-ray of energy 3.69 keV. Use the data from the previous problem to identify the element.

The K_β X-rays from certain elements are given below. Draw a Moseley-type plot of √v versus Z for K_β radiation.

The wavelengths of K_α and L_α X-rays of a material are 21.3 pm and 141 pm respectively. Find the wavelength of K_β X-ray of the material