SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Minute
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Second
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Mili seconds
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Hour
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Detailed explanation-1: -The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency Cs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s–1.
Detailed explanation-2: -Second is the SI unit of time. It is denoted by ‘s’. One second is defined as the time that elapses during 9192631770 cycles of the radiation produced by the transition between two levels of cesium 133 atoms.
Detailed explanation-3: -Basically time can be measured in seconds or minutes or hours or days. All of these are units of time. But SI units of time are seconds that is the reason most of the constants are measured per unit second or for unit seconds.