Home
Class 11
PHYSICS
The radiation emitted by a star A is 100...

The radiation emitted by a star `A` is `1000` times that of the sun. If the surface temperature of the sun and star `A` are `6000 K` and `2000 K` respectively. The ratio of the radii of the star `A` and the sun is:

A

`300:1`

B

`600:1`

C

`900:1`

D

`1200:1`

Text Solution

Verified by Experts

The correct Answer is:
C
`P=sigma(4piR^(2))T^(4)rArr(R_(A))/(R_(sun))=sqrt((P_(A))/(P_(Sun)))xx((T_(sun))/(T_(A)))^(2)`
Promotional Banner

Topper's Solved these Questions

  • TRANSMISSION OF HEAT

    NARAYNA|Exercise LEVEL-III (C.W)|1 Videos

  • TRANSMISSION OF HEAT

    NARAYNA|Exercise LEVEL- (C.W)|25 Videos

  • TRANSMISSION OF HEAT

    NARAYNA|Exercise LEVEL - 2 (C.W)|1 Videos

  • THERMODYNAMICS

    NARAYNA|Exercise Exercise|187 Videos

  • UNITS AND MEASUREMENTS

    NARAYNA|Exercise STATEMENT TYPE QUESTION|23 Videos

Similar Questions

Explore conceptually related problems

The radiation emitted by a star A is 10,000 times that of the sun. If the surface temperatures of the sun and the star A are 8000 K and 2000 K respectively. The ratio of the radii of the star A and the sun is

The radiation emitted by a star A is 10,000 times that of the sun. If the surface temperatures of the sun and the star A are 6000 K and 2000 K respectively, the ratio of the radii of the star A and the sun is

The radiation power emitted by a star "A" is 1000 times that of the sun.If the surface temperatures of the sun and star "A" are "6000K and "2000K" respectively,the ratio of the radii of the star "A" and the sun is

The radiation emitted by a star A is 100 times that of the sun. If the surface temperatures of the sun and the star are 6000 K and 2000 K respectively, then the ratio of the radii of the star and the sun is

The luminousity of a star is 10000 times that of the sun. if the surface temperature of the sun is 6000 K, then the surface temperature of the star is

Luminosity of Rigel star in Orion constellation is 17, 000 times that of our sun. If the surface temperature of the sun is 6000 K, calculate the temperature of the star.

The luminousity of a star is 10,000 times that of the sun and its surface temperature is 3000K . Assuming the surface of temperature of the sun to be 6000K , compare the radius of the star with that of the sun.

Two stars emit maximum radiation at wavelength 3600 Å and 4800 Å respectively. The ratio of their temperatures is

NARAYNA-TRANSMISSION OF HEAT-LEVEL - (C.W)
  1. Three rods of identical cross-sectional area and made from the same me...

    Text Solution

    |

  2. A cube of side 10cm is filled with ice of density 0.9//c.c Thickness o...

    Text Solution

    |

  3. A slab of stone area 3600 cm^(2) and thickness 10cm is exposed on the ...

    Text Solution

    |

  4. A black body is at a temperature of 2800K The energy of radiation emit...

    Text Solution

    |

  5. When the temperature of a black body increases, it is observed that th...

    Text Solution

    |

  6. For an enclosure maintained at 2000K, the maximum radiation occurs at ...

    Text Solution

    |

  7. The power radiated by a black is P and it radiates maximum energy arou...

    Text Solution

    |

  8. The rates of heat radiation from two patches of skin each of area A on...

    Text Solution

    |

  9. A spherical black body with a radius of 12cm radiates 450W power at 50...

    Text Solution

    |

  10. If the temperature of the sun were to increase form T to 2T and its ra...

    Text Solution

    |

  11. The radiation emitted by a star A is 1000 times that of the sun. If th...

    Text Solution

    |

  12. Two electric bulbs have filaments of lengths L and 2L diameters 2d and...

    Text Solution

    |

  13. If the absolute temperature of a black body is doubled the percentage ...

    Text Solution

    |

  14. A sphere and a cube of same material and same volume are heated up to ...

    Text Solution

    |

  15. A black metal foil is warmed by radiation from a small sphere at tempe...

    Text Solution

    |

  16. A very small hole in an electric furnace is used for heating metals. T...

    Text Solution

    |

  17. The surface of a black body is at a tempera ture 727^(@)C and its cros...

    Text Solution

    |

  18. A body cools down from 50^(@)C to 45^(@)C in 5 minutes and to 40^(@)C ...

    Text Solution

    |

  19. A hot body is placed in cold surroundings It's rate of cooling is 3^(@...

    Text Solution

    |

  20. A calorimeter of water equivalent 5g has water of mass 55g upto a cert...

    Text Solution

    |