56. Solving a chemistry problem

223. On the radiograph between the two reference lines are 6 spectral lines of the elements. The wavelengths of the reference lines are 900 and 1502 X, respectively. The distance between the fiducial marks is 98 mm. Determine the qualitative composition of the sample by measuring the distances between the first mark and the peaks of the spectral lines:
line no. 1 2 3 4 5 6
bi,mm 9.0 13.0 39.0 44.5 56.0 93.0