Unit and Dimension
Key points
Basic quantities and units
|S.N |Physical quantity |Name |Symbol |
|i |Length |Meter |m |
|ii |Mass |Kilogram |kg |
|iii |Time |Second |s |
|iv |Temperature |Kelvin |k |
|v |Luminous Intensity |Candela |cd |
|vi |Electric current |Ampere |A |
|vii |Amount of substance |mole |mol. |
i) Light year: it is the distance traveled by the light in one year in vacuum.
❖ 1 light year = 9.5 x 1015m = 9.5 x 1012 km
ii) Fermi: it is the smallest unit of distance used in Nuclear Physics
❖ 1 Fermi = 10-15 m = 10-13 cm.
|Dimensions and Dimensional Formula |
|S.N |Physical quantity |Dimensional formula |S.I units |
|1 |Linear momentum |[MLT-1] |kgms-1 |
|2 |Work or energy |[ML2 T-2 ] |Kgm2 s-2 |
|3 |Power...