If a wire 375 feet long has 500 ohms of resistance, what is the resistance of 1,000 feet of the same wire? a. 1,333 ohms
b. 187.5 ohms
c. 1,691 ohms
d. 750 ohms

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The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

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