Question

define second and write its subunits and multiple ​

Answer 1

Answer:

The second (symbol: s, abbreviation: sec) is the base unit of time in the International System of ... Although the historical definition of the unit was based on this division of the ... Multiples of seconds are usually counted in hours and minutes. ... radiation) is very specific depending on the type of atom and how it is excited.

Explanation:

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Answer 2

constituting number two in a sequence; coming after the first in time or order;

subunit is millisecond and multiple minute hope it helps ☺️