Continuous X-rays are made to strike a tissue paper soaked with polluted water. The incoming X-rays excite the atoms of the sample by knocking out the electrons from the inner shells. Characteristic X-rays are subsequently emitted. The emitted X-rays are analysed and the intensity is plotted against the wavelength (figure 44-E1). Assuming that only Ka intensities are detected, list the elements present in the sample from the plot. Use Moseley'* equation v = (25 x 10 14 Hz) (Z- l)2.
