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The wavelength axis of the spectra shown uses the angstrom, where one angstrom equals:
A100 nanometres
B0.1 nanometres
C1.0 nanometres
D10 nanometres
Answer & Solution
Correct answer: B. 0.1 nanometres
1. Different parts of the electromagnetic spectrum are quoted in different units.
2. Because the technologies developed for each part differ, for reasons of convenience and historical legacy, different units are typically used.
3. The wavelength axis of these spectra uses the angstrom length unit, where 1 angstrom equals 0.1 nanometres.
4. So ten angstroms make one nanometre.
5. The unit suits atomic-scale distances, which is why crystallographers still use it.
_Source: OpenStax Chemistry 2e (CC BY 4.0), Ch 6 'Electronic Structure and Periodic Properties of Elements', sections 6.1-6.5_
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