assume that you take a measurement with a metric ruler that is divided into individual millimeters. which…

assume that you take a measurement with a metric ruler that is divided into individual millimeters. which measurement has the correct number of significant figures?\na 21 mm\nb 21.0 mm\nc 21.00 mm\nd none of the above

assume that you take a measurement with a metric ruler that is divided into individual millimeters. which measurement has the correct number of significant figures?\na 21 mm\nb 21.0 mm\nc 21.00 mm\nd none of the above

Answer

Explanation:

Step1: Understand significant figures

When using a metric ruler divided into individual millimeters, we can estimate to the tenths - place.

Step2: Analyze option a

21 mm has 2 significant figures. But we can be more precise.

Step3: Analyze option b

21.0 mm has 3 significant figures. The zero is significant as it is a measured digit (estimated to the tenths - place on the ruler).

Step4: Analyze option c

21.00 mm implies a precision that is not achievable with a ruler divided into individual millimeters. We can only estimate to the tenths - place, not the hundredths - place.

Step5: Analyze option d

Since option b is correct, this is incorrect.

Answer:

B. 21.0 mm