A laser emits light of wavelength

PHYSICS · Single correct · A Level · Physics · Measurements and their errors · Measurements and their errors

Problem

A laser emits light of wavelength 632.8 nm632.8\,\text{nm}. When this value is expressed in metres in scientific notation, and its order of magnitude is stated, which one of the following pairs is correct? (a) 6.328×10−7 m;  −76.328\times10^{-7}\,\text{m};\; -7 (b) 6.328×10−7 m;  −66.328\times10^{-7}\,\text{m};\; -6 (c) 0.6328×10−6 m;  −60.6328\times10^{-6}\,\text{m};\; -6 (d) 6.328×10−8 m;  −86.328\times10^{-8}\,\text{m};\; -8

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