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what is candela ??(in Si units)
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Answers
Answer:
❤️❤️Candela (cd), unit of luminous intensity in the International System of Units (SI), defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and has a radiant intensity in that same direction of 1/683 watt per steradian (unit solid angle).❤️❤️
Explanation:
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Answer:
How much brighter is a flashlight (torch) than a candle? Clearly it depends on how powerful the flashlight is, but there are other factors too. For example, the candle spreads its light in all directions whereas the flashlight is highly directional. This makes direct comparisons a little tricky, but not impossible. This is where the SI quantity of luminous intensity is useful. It has the SI unit candela and the symbol cd.
Explanation:
For much of history the candle was used as a measure of the intensity of light. This made sense in a world without light bulbs or other forms of artificial light, even if each country tended to use a slightly different kind of candle as its "standard". Things started to get complicated not just with the invention of light bulbs, but also with a greater understanding of the different colours of light. For example, the Sun's light is composed of all of the different colours mixed together, but, as seen from space, is faintly yellow in colour, meaning that it shines slightly more brightly in yellow than the other colour components.