Final answer:
630μs is equivalent to 0.000630 seconds when written in standard SI units without any metric prefixes, maintaining the number of significant figures.
Step-by-step explanation:
The given value of 630μs (microseconds) needs to be converted to the full decimal number in standard SI units without any prefixes, maintaining the same number of significant figures. The prefix 'micro' denotes a factor of 10-6. Therefore, to write 630μs in standard SI units, we multiply 630 by 10-6. The resulting value in seconds, preserving significant figures, is:
0.000630 s.