Stellar luminosity Flashcards

1
Q

What is a black body?

A

An idealised object that absorbs all the electromagnetic radiation that shines onto it and when, in thermal equilibrium, emits a characteristic distribution of wavelengths at a specific temperature.

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2
Q

What is Wien’s displacement law?

A

Maximum wavelength is inversely proportional to T

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3
Q

What is Stefan’s law?

A

The total power radiated per unit surface area of a black body is directly proportional to the fourth power of the absolute temperature of the black body.

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4
Q

What does Stefan’s law show?

A

The lumionsity of a star is directly proportional to:

  • its radius squared
  • surface area
  • absolute temperature to the power of 4
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5
Q

What is luminosity?

A

The total energy a star emits per second i.e. its power output.

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