Certain elements emit light of a specific wavelength when they are burned. Historically, chemists used such emission wavelengths to determine whether specific elements were present in a sample. Characteristic wavelengths for some of the elements are given in the following table:
| Ag |
328.1nm |
Fe |
372.0nm |
| Au |
267.6nm |
K |
404.7nm |
| Ba |
455.4nm |
Mg |
285.2nm |
| Ca |
422.7nm |
Na |
589.6nm |
| Cu |
324.8nm |
Ni |
341.5nm |
(a) Determine which elements emit radiation in the visible part of the spectrum.
(b) Which element emits photons of highest energy? Of lowest energy?
(c)When burned, a sample of an unknown substance is found to emit light of frequency . 6.59 X 1014 s-1 Which of these elements is probably in the sample?