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The SI unit of luminous intensity is...

The SI unit of luminous intensity is

A

ampere

B

candela

C

mole

D

none of these

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The correct Answer is:
To solve the question regarding the SI unit of luminous intensity, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Luminous Intensity**: - Luminous intensity is a measure of the perceived power of light emitted by a source in a particular direction. It is one of the seven fundamental physical quantities in the International System of Units (SI). 2. **Identifying the SI Unit**: - The SI unit for luminous intensity is defined and recognized as the "candela." 3. **Verifying the Options**: - The question may provide multiple-choice answers. We need to evaluate the options given: - Option 1: Ampere (unit of electric current) - Option 2: Candela (unit of luminous intensity) - Option 3: Mole (unit of amount of substance) - Option 4: None of these 4. **Selecting the Correct Answer**: - Among the options, the correct answer is "Candela," as it is specifically defined as the unit of luminous intensity in the SI system. 5. **Conclusion**: - Therefore, the SI unit of luminous intensity is **candela**. ### Final Answer: The SI unit of luminous intensity is **candela**. ---
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Photometry: The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 xx 10^12 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted solid angle is one lumen (1m). A standa o incandescent light bulb emits approximately 1700 lumens. Unit of luminous flux is:

Photometry: The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 xx 10^12 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted solid angle is one lumen (1m). A standa o incandescent light bulb emits approximately 1700 lumens. Light received by human eye is analysed by:

Photometry: The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 xx 10^12 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted solid angle is one lumen (1m). A standard 100 watt incandescent light bulb emits approximately 1700 lumens. A standard 100 watt incandescent light bulb emits approximately:

Photometry: The measurement of light as perceived by human eye is called photometry. Photometry is measurement of a physiological phenomenon, being the stimulus of light as received by the human eye, transmitted by the optic nerves and analysed by the brain. The main physical quantities in photometry are (i) the luminous intensity of the source, (ii) the luminous flux or flow of light from the source and (iii) illuminance of the surface. The SI unit of luminous intensity (I) is candela (cd). The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 xx 10^12 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. If a light source emits one candela of luminous intensity into a solid angle of one steradian, the total luminous flux emitted solid angle is one lumen (1m). A standa o incandescent light bulb emits approximately 1700 lumens. What is photometry?

What is the SI unit of luminous intensity?

Write the SI unit of luminous intensity and the amount of substance.

Match the entries in Column A with entries in Column B {:(,"Column A",,"Column B"),((A),"SI unit of electric current",(a),"Candela"),((B),"CGS units of time",(b),"Ampere"),((C),"SI unit of luminous intensity",(c),"Metre"),((D),"SI unit of distance",(d),"Second"):}