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| Q. |
The different colours of different stars are due to the variation of – |
| A. | temperature |
| B. | pressure |
| C. | density |
| D. | radiation from them |
| Answer» A. temperature | |
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Explanation: 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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