2. Practice: Look at the quantities mentioned in the Metric units only Distance problems. For each value, state the number of significant digits in the first column and the rule(s) you used
to determine the number of significant digits. The first has been done for you.
Question
Number of
significant digits
Rule(s) used
I
3
1.4
The tallest building in the world, the Burj Khalifa in
Dubai, is 0.828 kilometers high.
The largest human cell is the egg cell, with a
diameter of 121 micrometers.
On a caterpillar's map, all distances are marked
in millimeters. The caterpillar's map shows that
the distance between two milkweed plants is
4,012 millimeters.
The closest star to our Sun is Proxima Centauri,
which is 4.242 light years away.
A helium atom has a diameter of 9.8. 10°
meters.