Question

how many significant figures are there in the measured quantity 0.670 mg?

Explanation:

Step1: Recall significant - figure rules

Non - zero digits are always significant. Zeros between non - zero digits are significant. Trailing zeros in a number with a decimal point are significant.

Step2: Analyze 0.670

The non - zero digits 6 and 7 are significant. The zero after 7 is a trailing zero in a number with a decimal point, so it is also significant. So, there are 3 significant figures.

Answer:

D. Three significant figures