Astronomy class

Whose law tells you which wavelength of light is most intense for an object?

• Wien's
• Kirchoff's
• Boltzmann's
• Doppler's

What are packets of light called?

• packtons
• protons
• photons
• tachyons

What type of spectrum is given off by a gas when heated?

• continuous
• absorption
• emission
• spectral

What type of spectrum is created when light passes through a cool, transparent gas?

• continuous
• emission
• absorption
• spectral

Wien's Law states that the higher the temperature, the shorter the peak wavelength of a blackbody's radiation.

• True

• False

A Blackbody is an object that ....

• Absorbs the electromagnetic radiation in the UV range and re-emits the same amount of radiation.

• Absorbs all the electromagnetic radiation that falls on it and re-emits the same amount of radiation.

• Absorbs all the electromagnetic radiation that falls on it and re-emits 50% of the absorbed radiation.

• Absorbs all the electromagnetic radiation that falls on it and re-emits 25% of the absorbed radiation

What is energy flux? (Pick all that apply)

• The total amount of energy emitted per square meter every second.

• A relationship between time and temperature

• Rate of flow

• Is equal to the T⁴σ (Stefan-Boltzmann)

Light beams are continuous.

• True

• False

Luminosity is amount of a star's total energy output. What variables do you need to determine a star's luminosity?

• Temperature and Radius

• Temperature and distance

• Temperature and Surface area

• Temperature and Mass