Significant Figures in 0.008403

Significant figures are the digits in a number that carry meaning in terms of the precision or accuracy of the measurement. In other words, significant figures indicate the level of uncertainty in a measurement. The number of significant figures in 0.008403 can be determined by following these steps:

Step 1: Identify Non-Zero Digits
Non-zero digits are always significant. In 0.008403, there are two non-zero digits: 8 and 4.

Step 2: Identify Zero Digits
Zero digits placed between two non-zero digits are always significant. In 0.008403, there are two zero digits between the non-zero digits: 0 and 0.

Step 3: Identify Trailing Zero Digits
Trailing zero digits at the end of a number are considered significant only if the number contains a decimal point. In 0.008403, the last three zeros are trailing zeros but they are significant because the number contains a decimal point.

Step 4: Count the Significant Figures
By following the above steps, we have identified six significant figures in 0.008403.

Answer: Option (A) 6