Home
Class 12
PHYSICS
Iluminance of 2.4 xx 10^(5)lm//m^(2) of ...

Iluminance of `2.4 xx 10^(5)lm//m^(2)` of the surface is produced by sunlight falling normally on the surface of the earth. The distance of the earth the sun is `1.5 xx 10^(8)km`. Calculate the luminous intensity and luminous flux of the sun.

Text Solution

Verified by Experts

The correct Answer is:
`5.4 xx 106(27) cd, 6.78 xx 10^(28)lm`
Promotional Banner

Topper's Solved these Questions

  • RAY OPTICS

    SL ARORA|Exercise TYPE F|10 Videos

  • RAY OPTICS

    SL ARORA|Exercise TYPE I|12 Videos

  • RAY OPTICS

    SL ARORA|Exercise TYPE A|15 Videos

  • OPTICAL INSTRUMENTS

    SL ARORA|Exercise Problems for self practice|35 Videos

  • SOLIDS AND SEMICONDUCTOR DEVICES

    SL ARORA|Exercise PROBLEM_TYPE|9 Videos

Similar Questions

Explore conceptually related problems

The mean orbital radius of the Earth around the Sun is 1.5 xx 10^8 km . Estimate the mass of the Sun.

The time period of jupiter is 11-6 year, how far is jupitor from the sun. Distance of earth from the sun is 1.5 xx 10^(11) m .

The angular diameter of the sun is 1920". If the distance of the sun from the earth is 1.5xx10^(11) m, what is the linear diameter of the sun ?

A frosted bulb which may be taken as an isotropic source, gives as illumination of 8lm//m^(2) at a distance of 5m. Calculate (i) its luminous intensity and (ii) the total luminous flux from the blub.

If the diameter of the Sun is 1.4xx10^(9)m and that of Earth is 1.275xx10^(4)km. Compare the two.

The mean distance of sun from the earth is 1.5xx10^8km . The time taken by light to reach earth from the sun is

The average distance between the surface of the Earth and the surface of the Sun is 1.49xx10^(11) m. How much time in minutes does it take for light leaving the surface of the Sun to reach the Earth ?

The distance of a planet from the sun is 5 times the distance between the earth and the sun. The time period of the planet is

SL ARORA-RAY OPTICS-Problems For Self Practice
  1. A 60W lamp is rated at 0.8 watt/candela. Calculate (i) luminous inten...

    Text Solution

    |

  2. Iluminance of 2.4 xx 10^(5)lm//m^(2) of the surface is produced by sun...

    Text Solution

    |

  3. The luminous effeciency of a lamp is 51mW^(-1) and its luminous intens...

    Text Solution

    |

  4. At what distance form a light source of 64 cd, will the intensity of i...

    Text Solution

    |

  5. Calculate the illuminance at a surface distance 0.5m from a ligth sour...

    Text Solution

    |

  6. A good photographic print is obtained by an exposure of 2s at a distan...

    Text Solution

    |

  7. Two lamps of illuminating powers 25 cd and 100 cd are placed at the en...

    Text Solution

    |

  8. Two light sources of intensities 8 cd and 12 cd are placed on the same...

    Text Solution

    |

  9. A lamp is hanging at a height of 4 m above a table. The lamp is lowere...

    Text Solution

    |

  10. In Bunsen's grease spot photometer, light from a lamp with dirty chimn...

    Text Solution

    |

  11. An electric bulb illuminates a plane surface. The intensity of illumin...

    Text Solution

    |

  12. A lamp is hanging along the axis of a circular table of radius r. at w...

    Text Solution

    |

  13. An electric bulb is hanging above the centre of a circular table of ra...

    Text Solution

    |

  14. In Fig. the circular cross-section of tunnel is shown. A 100 W almp is...

    Text Solution

    |

  15. A frosted bulb which may be taken as an isotropic source, gives as ill...

    Text Solution

    |

  16. A man is running away from a plane mirror at the speed of 5 ms^(-1). W...

    Text Solution

    |

  17. A plane mirror rotating at an angular velocity of 3 radian/s reflects ...

    Text Solution

    |

  18. A ray of light is incident at an angle of 60^(@) on a horizontal plane...

    Text Solution

    |

  19. rays of light strike a horizontal plane mirror at an angle of 45^(@). ...

    Text Solution

    |

  20. Two plane mirrors are inclined at angle theta as shown in figure. If a...

    Text Solution

    |