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QUESTION
How long in meters is 670 nanometers?
##670## nanometers is ##670xx10^(-9)## meters or ##6.7xx10^(-7)## meters in or ##0.00000067## meters in standard form.
In metric system everything is standardized. In metric system as nano is one-billionth or ##10^(-9)##.
One nanometer is ##10^(−9)## meter, hence
##670## nanometers is ##670xx10^(-9)## meters or ##6.7xx10^(-7)## meters in scientific notation or ##0.000000670## meters.
