Question
Download Solution PDFWhich of the following is the SI unit of luminous intensity?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is Candela.
- Candela is the unit of luminous intensity in the International System of Units.
- It is defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz.
- It has a radiant intensity in that same direction of 1/683 watt per steradian.
- The candela has replaced the standard candle or lamp as a unit of luminous intensity in calculations involving artificial lighting and is sometimes called the new candle.
- It is the unit of Luminous intensity. The symbol of Candela is Cd.
Additional Information
| Lambert |
The lambert is a non-SI metric unit of luminance. It is named after Johann Heinrich Lambert, a Swiss mathematician, physicist, and astronomer. A related unit of luminance, the foot-lambert, is used in the lighting, cinema, and flight simulation industries. |
| Joule |
A joule is a derived unit of energy in the International System of Units. It is equal to the work done by a force of one newton acting through one meter. It is named in honor of the English physicist James Prescott Joule. It equals 107 ergs or approximately 0.7377-foot-pounds. |
| Ampere |
Ampere is the unit of electric current in the International System of Units. The ampere would henceforth be defined such that the elementary charge would be equal to 1.602176634 × 10−19 coulomb. Unit of Electric current. Named after Andre-Marie Ampere. |
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