Which SI unit measures luminous intensity?

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Prepare for the TEAS 7 Scientific Reasoning Test. Study with interactive questions and detailed explanations, designed to boost your confidence and help you succeed on the exam.

Multiple Choice

Which SI unit measures luminous intensity?

Explanation:
Luminous intensity describes how much light a source emits in a specific direction, and the SI unit for that quantity is the candela (cd). Candela is one of the SI base units and is used to express brightness in a particular direction, unlike meters or kilograms, which measure length and mass, or liters, which measure volume. Related ideas include luminous flux (measured in lumens) and illuminance (measured in lux), but those quantify total light or light per area, not brightness in a single direction. So, for measuring how bright something is in a given direction, the unit is candela.

Luminous intensity describes how much light a source emits in a specific direction, and the SI unit for that quantity is the candela (cd). Candela is one of the SI base units and is used to express brightness in a particular direction, unlike meters or kilograms, which measure length and mass, or liters, which measure volume. Related ideas include luminous flux (measured in lumens) and illuminance (measured in lux), but those quantify total light or light per area, not brightness in a single direction. So, for measuring how bright something is in a given direction, the unit is candela.

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