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The SI unit of luminous intensity is...

The SI unit of luminous intensity is

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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"):}

PRADEEP-PHYSICAL WORLD AND MEASUREMENT-Fill in the blanks
  1. According to Einstein, time is …………….

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  2. The units of measurement of ……………….. And …………….. Are called …………….. .

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  3. The SI unit of luminous intensity is

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  4. One radian is the angle subtended at …………. By an arc ……………… .

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  5. One light year is ……………. In vacuum in…………….. .

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  6. The year in which there is total solar eclipes is called a …………….. .

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  7. An area of 10^4 m^2 is called ……………… .

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  8. Order of magnitude of a quantity is the ……….., which gives us a value…...

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  9. The estimated size of observable universe is of the order of………

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  10. The parallax method has been used for measuring distances of stars, wh...

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  11. The smallest mass is that of ………….. Of the order of …………… kg.

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  12. Masses of atomic// subatomic particles are measured using a …………….. .

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  13. Time taken by light to cross a distance of nuclear size is of the orde...

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  14. Age of universe is of the order of ………. Second.

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  15. …………… is used for measurig long time intervals of the order of ……….. S...

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  16. Any phenomenon that…………. Can serve as a …………… .

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  17. An optical microscope uses visible light of wavelength ranging from ……...

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  18. Universal gravitational constant, universal gas constant and …….. Are ...

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  19. Methematical constants, pi, etc. are called ……….. .

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  20. Angle, …………. And ……. Are some of the ……….. Variables.

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