Question

Determine the number of significant digits in the measurement.

0.00025 km
a.
6
b.
5
c.
1
d.
2

Answer 1

2:
The zeros before the non-zero digits aren't significant because there aren't any other non-zero digits in front of the,.

Answer 2

0.00025 [km] = 0.25 [m] = 2.5 x10^-1 [m] = 2.5 [dm]