What does Angstrom measure ?

What does Angstrom measure ? Correct Answer length of light waves

Angstrom (Å), unit of length, equal to 10−10 metre, or 0.1 nanometre. It is used chiefly in measuring wavelengths of light. (Visible light stretches from 4000 to 7000 Å.) It is named for the 19th - century Swedish physicist Anders Jonas Ångström.
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