Reaction times in laboratories are __________ of a second.?

Question

A. 3/4

B. 2/3

C. 1/2

D. 1/3

Answer 1

Are you talking about human reaction time?  That is pretty much a constant and averages about 0.20 seconds.

If you are talking about a chemical reaction then that can run from nanoseconds to days or weeks or months

Answer 2

That depends on the reaction.  It can be even hours and days.

Answer 3

2/3

Answer 4

Really depends.  But they are normally 1/3.