Home
Class 12
PHYSICS
Find the luminous flux of 10 W source o...

Find the luminous flux of 10 W source of 600 nm. The relative luminosity at 600 nm is 0.6.

Text Solution

Verified by Experts

The luminous flux of a1W of 55=m=685 lumen. Thus, the luminous flux of a 10 W source of 555=6850 luen. The luminus flux of a 10 W source of 600 nm is, therefoe `0.6xx6850` lumen =4110 lumen.
Promotional Banner

Topper's Solved these Questions

  • PHOTO ELECTRIC EFFECT AND WAVE PARTICLE DUALITY

    HC VERMA|Exercise Exercise|35 Videos

  • SEMICONDUCTOR AND SEMICONDUCTOR DEVICES

    HC VERMA|Exercise exercises|35 Videos

Similar Questions

Explore conceptually related problems

A source emits light of wavelengths 555 nm and 600 nm. The radiant flux of the 555 nm part is 40 W and of the 600 nm part is 30 W. The relative luminosity at 600 nm is 0-6. Find (a) the total radiant flux, (b) the total luminous flux, (c) the luminous efficiency.

A point source emitting uniformly in all directions is placed above a table top at a distance of 0.50 m from it. The luminous flux of the source is 500 lumen. Find the illuminance at a small surface area of the table to a.directly below the source and b. at as distance of 0.80 m from the source.

A source emits 12.0 J of lightof wavelength 620 nm and 8.0 J of light of wavelength 580 nm per second. The relative luminosilty at 620 is 25% and that at 580 nm is 80%. Find a the total radiant flux, b. the total luminous flux and c. and luminous efficiency.

The luminous flux of a monochromatic source of 1 W is 450 lumen W^-1 . Find the relative luminosity at the wavelength emitted.

The luminous flux of a 1 W sodium vapour lamp is more than that of a 10 kW source of ultraviolet radiation. Comment.

A source emits 31.4 W of radiant flux distributed uniformly in all directions. The luminous efficiency is 60 lumen watt. What is the luminous intensity of the source ?

A circular area of radius 1.0 cm is placed at a distance of 2.0 m from a point source. The source emits light uniformly in al directions. The line joining the source to the center of the area is normal to the area. It is found that 2.0xx1^-3 lumen of luminous flux is incident on the area. Calculate the total luminous flux emitted by the source and the luminous intensity of the source along the axis of the area.

The luminous intensity of a small plane source of light along the forward normal is 160 candela. Assume the source to be perfectly diffused, find the luminous flux emitted into a cone of solid angle 0.02 sr around a line making an angle of 60^@ with the forward normal.

Electromagnetic waves travel in a medium at a speed of 2.0xx10^(8)ms^(-1) . The relative permeability of the medium is 1.0. Find the relative permittivity.

The relative luminosity of wavelength 600 nm is 0.6. Find the radiant flux of 600 nm needed to produce the same brightness sensation as produced by 120 W of radiant flux at 555 nm.

HC VERMA-PHOTOMETRY-All Questions
  1. Find the luminous flux of 10 W source of 600 nm. The relative luminos...

    Text Solution

    |

  2. A source emits 12.0 J of lightof wavelength 620 nm and 8.0 J of light ...

    Text Solution

    |

  3. A circular area of radius 1.0 cm is placed at a distance of 2.0 m from...

    Text Solution

    |

  4. The overall luminous efficient of a 100 W electric lamp is 25 lumen W^...

    Text Solution

    |

  5. A point source emitting uniformly in all directions is placed above a ...

    Text Solution

    |

  6. The luminous intensity of a small plane source of light along the forw...

    Text Solution

    |

  7. What is the luminous flux of a source emitting radio waves ?

    Text Solution

    |

  8. The luminous flux of a 1 W sodium vapour lamp is more than that of a 1...

    Text Solution

    |

  9. Light is incident normally on a small plane surface. If the surface is...

    Text Solution

    |

  10. A bulb is hanging over a table. At which portion of the table is the i...

    Text Solution

    |

  11. The sun is less bright at morning and evening as compared to at noon a...

    Text Solution

    |

  12. Why is the luminous efficiency small for a filament bulb as compared t...

    Text Solution

    |

  13. The yellow colour has a greater luminous efficiency as compared to the...

    Text Solution

    |

  14. The one parameter that determines that brightness of a light source se...

    Text Solution

    |

  15. Three light sources A,B, and C emit equal amount of radiant energy per...

    Text Solution

    |

  16. As the wavelength is increased form violet to red, the luminosity

    Text Solution

    |

  17. An electric bulb is hanging over a table at a height of 1 m above it. ...

    Text Solution

    |

  18. Light from a point source falls on a screen. If the separation between...

    Text Solution

    |

  19. A battery operated tourch is adjusted to send and almost parallel beam...

    Text Solution

    |

  20. The intensity produced by a long cylindrical light source at a small d...

    Text Solution

    |