SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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m/s
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m, meters
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S, Space
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s, seconds
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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, fundamental unit of time, now defined in terms of the radiation frequency at which atoms of the element cesium change from one state to another. The second was formerly defined as 1/86, 400 of the mean solar day-i.e., the average period of rotation of the Earth on its axis relative to the Sun.
Detailed explanation-3: -Although not an SI unit, the minute is accepted for use with SI units. The SI symbol for minute or minutes is min (without a dot).