Classification of stars (AQA A-Level Physics): Quizzes

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Classification by temperature, black-body radiation
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What does a black body perfectly emit and absorb?

All wavelengths of radiation

Which celestial objects can be approximated as black bodies?

Stars

In Stefan's law P=σAT4P = \sigma A T^4, what power does temperature have?

Fourth power

What is the value of Stefan-Boltzmann constant σ\sigma?

5.67×10−85.67 \times 10^{-8} W m−2^{-2} K−4^{-4}

What is the relationship between peak wavelength and temperature in Wien's law?

Inversely proportional

What is Wien's displacement law constant?

2.9×10−32.9 \times 10^{-3} m K

What type of wavelengths do hotter objects emit?

Shorter wavelengths

What happens to the peak of a black-body curve as temperature increases?

Shifts to shorter wavelengths

What is the formula for the inverse square law of intensity?

I=P4πd2I = \frac{P}{4 \pi d^2}

What does intensity of light from a star represent?

Power per unit area

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