JAMB - Mathematics (1981 - No. 18)
A micrometer is defined as one millionth of a millimeter. A length of 12,000 micrometres may be represented as
0.00012m
0.0000012m
0.000012m
0.00000012m
0.000000012m
Explication
1 UM = 10\(^{-6}\)mm
= 10\(^{-9}\)m
1.2 x 10\(^4\) x 10\(^{-9}\)m
= 1.2 x 10\(^{-5}\)m = (0.000012)m
= 10\(^{-9}\)m
1.2 x 10\(^4\) x 10\(^{-9}\)m
= 1.2 x 10\(^{-5}\)m = (0.000012)m