Normally, the reported result of measurement is a number that includes all digits in the number that are known reliably plus first digit that is uncertain. The digits that are known reliably plus the first uncertain digit are known as significant digits or significant figures.
e.g. When a measured distance is reported to be 374.5 m, it has four significant figures 3, 7, 4 and 5. The figures 3, 7, 4 are certain and reliable, while the digit 5 is uncertain. Clearly, the digits beyond the significant digits reported in any result are superfluous.
Choose the correct option.
Options:
(a) Change in unit does not change the significant figure.
(b) `4.700 m=4700 mm,` here there is a change of significant number from 4 to 2 due to change in unit.
(c) `4700m=4.700 xx 10^3m`, here there is change in numbers of significant numbers.
(d) Change in unit changes the number of significant figure.