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      Question

      The different colours of different stars are due to the

      variation of –
      A temperature Correct Answer Incorrect Answer
      B pressure Correct Answer Incorrect Answer
      C density Correct Answer Incorrect Answer
      D radiation from them Correct Answer Incorrect Answer

      Solution

      Shortly after blackbody radiation was understood, it was noticed that the spectra of stars look extremely similar to blackbody radiation curves of various temperatures, ranging from a few thousand Kelvin to ~50,000 Kelvin. The obvious conclusion is that stars are similar to blackbodies, and that the colour variation of stars is a direct consequence of their surface temperatures.

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