Definition of Base Unit Candela (cd) : -- F.Sc. (Class 11) Physics Important Student Learning Output (SLO) based Notes

Q. Define Candela (cd).

Answer:

Candela (cd):

It is the base unit of the luminous intensity in the International System of Units (SI), having the unit symbol 'cd'.

Definition:

The candela is the luminous intensity, in the perpendicular direction, of a surface of 1 / 600 000 square meters of a black body at the temperature of freezing platinum under a pressure of 101,325 Newton per square meter.

or

The candela is the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 x 10¹² Hz. 

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