Numford

SI base quantitiesClass 11, Units and Measurements

Dimensional formula of Luminous intensity

[cd]

SymbolIv SI unitcandela (cd)

The SI base quantity for the brightness of a light source in one direction. It is rarely used in Class 11 and 12 calculations.

Derivation

How to get the dimensional formula of luminous intensity

  1. Luminous intensity is one of the seven SI base quantities, so its dimension is written directly: [cd].
Same dimensions

Quantities with the dimensions [cd]

Equal dimensions do not make them the same quantity. Compare luminous intensity with the others in the full grid.

Practice

Three questions on luminous intensity

1Which of these has the same dimensions as luminous intensity?

2What is the SI unit of luminous intensity?

3Do luminous intensity and amount of substance have the same dimensions?

Questions

Luminous intensity: quick answers

What is the dimensional formula of luminous intensity?

The dimensional formula of luminous intensity is [cd]. It is one of the seven SI base quantities.

What is the SI unit of luminous intensity?

The SI unit of luminous intensity is the candela (cd).

Which quantities have the same dimensions as luminous intensity?

Luminous intensity shares [cd] with luminous flux. Equal dimensions do not make them the same quantity.

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