Question

how many significant figures does the following number have: 0.002040

Explanation:

Step1: Recall significant - figure rules

Non - zero digits are always significant. Zeros between non - zero digits are significant. Leading zeros (zeros before the first non - zero digit) are not significant. Trailing zeros (zeros after the last non - zero digit) in a number with a decimal point are significant.

Step2: Analyze the number 0.002040

The leading zeros (the three zeros before 2) are not significant. The non - zero digits 2, 4 are significant. The zero between 2 and 4 is significant, and the trailing zero after 4 is significant.

Answer:

4