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A

A) The luminous efficiency of a monochromatic source is always greater than that of a white light source of same power.

B

B) The luminous efficiency of a monochromatic source of wavelength 555 nm is always greater than that of white light source of same power.

C

C) The illuminating power of a monochromatic source of wavelength 555 nm is always greater than that of a white light source of same power.

D

D) The illuminating power of a monochromatic source is always greater than that of a white light source of same power.

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B, C
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HC VERMA-PHOTOMETRY-All Questions
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  6. A photographic plate records sufficient intense lines when it is expos...

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  7. Using figure 22.1, find the relative luminosity of wavelength (a) 480 ...

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  8. The relative luminosity of wavelength 600 nm is 0.6. Find the radiant ...

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  9. The luminous flux of a monochromatic source of 1 W is 450 lumen W^-1. ...

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  10. A source emits light of wavelengths 555 nm and 600 nm. The radiant flu...

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  11. A light source emits monochromatic light of wavelength 555 nm. The sou...

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  12. A source emits 31.4 W of radiant flux distributed uniformly in all dir...

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  13. A point source emitting 628 lumen of luminous flux uniformly in all di...

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  14. The illuminance of a small area changes from 900 lumen m^-2 to 400 lu...

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  15. A point source emitting light uniformly in all directions is placed 60...

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  16. Light from a point source falls on a small area placed perpendicular t...

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  17. A student is studying a book placed near the edge of a circular table ...

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  18. Figure shows a small diffused plane source S placed over a horizontal ...

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  19. An electric lamp and a candle produce equal illuminance at a photomete...

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