Astronomy, Unit 3 FA: Blackbody Radiation (A.10A, LT 5-9)

As the temperature of a hot metal filament light bulb increases, it begins to emit visible light. This is explained by the principle of

• quantum entanglement

• thermal expansion

• electrical resistance

• blackbody radiation

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A ​ (a)   is a perfect absorber of all electromagnetic radiation incident upon it.

• whitebody
• graybody
• transparent body
• blackbody

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What is the term used to describe the electromagnetic waves emitted by a blackbody?

• Blackbody radiation

• Thermal radiation

• Visible radiation

• Infrared radiation

What determines the wavelength at which the radiated energy of an object is at its maximum?

• The temperature (T) of the object

• The mass of the object

• The volume of the object

• The color of the object

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The intensity I(λ,T) of blackbody radiation is dependent on

• The wavelength ( λ ) of the emitted radiation

• The temperature ( T ) of the blackbody

• The wavelength ( λ ) of emitted radiation and the temperature ( T ) of the blackbody

• Neither the wavelength ( λ ) nor the temperature ( T )

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According to the text, what does the function I(λ,T) represent?

• The total energy emitted by the blackbody

• The power intensity that is radiated per unit wavelength

• The temperature of the blackbody

• The wavelength of the emitted radiation

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What does Wien's displacement law illustrate?

• The relationship between the temperature and the total energy emitted

• The relationship between the temperature and the wavelength corresponding to the emission peak

• The relationship between the wavelength and the power intensity

• The relationship between the temperature and the radiation intensity

According to Wien's displacement law, what is the relationship between the temperature of an emitting body and the wavelength of the radiation it emits?

• The temperature is directly proportional to the wavelength.

• The temperature is inversely proportional to the wavelength.

• The temperature is equal to the wavelength.

• The temperature is unrelated to the wavelength.

Consider the stars Betelgeuse and Rigel in the constellation Orion. Which of these two stars is cooler?

• Betelgeuse

• Rigel

• They are the same temperature.

• Cannot be determined based on the information provided.

In the context of Wien's displacement law, the symbol λ_max represent?

• The speed of light

• The wavelength at which a blackbody radiates most strongly

• The energy of a photon

• The frequency of the radiation

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