The black lines in the solar spectrum during a solar eclipse can be explained by

  • A
    Planck's law
  • B
    Kirchhoff's law
  • C
    Boltzmann's law
  • D
    Solar disturbances

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$A$ perfect black body is ........

$A$ sphere,a cube,and a thin circular plate,all made of the same material and having the same mass,are heated to the same temperature of $200^{\circ} C$. When these are left in a room,which one reaches room temperature the fastest?

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