Black-body radiation and stellar luminosity Quiz
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5 questions, one answer each
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1. A star's temperature doubles and its radius is unchanged. Its luminosity increases by a factor of:
- A. 2
- B. 4
- C. 8
- D. 16
2. A black body has λ_max = 580 nm. Another has λ_max = 290 nm. The second is:
- A. half the temperature
- B. twice the temperature
- C. four times the temperature
- D. at the same temperature
3. The distance from a star is trebled. The intensity becomes:
- A. one third
- B. one sixth
- C. one ninth
- D. three times
4. Which star colour indicates the highest surface temperature?
- A. Red
- B. Yellow
- C. Orange
- D. Blue-white
5. A cool red supergiant has a very high luminosity mainly because it has:
- A. a very high temperature
- B. a very large surface area
- C. a short peak wavelength
- D. a very high intensity at Earth