An ideal body or surface that completely absorbs all radiant energy falling upon it with no reflection and that radiates at all frequencies with a spectral energy distribution dependent on its absolute temperature

• Blackbody

• Microwave

• Stefan-Boltzmann Law

• Wien's Law

The entire range of wavelengths or frequencies of electromagnetic radiation extending from gamma rays to the longest radio waves and including visible light

• Energy Flux

• Radio waves

• Visible Light

• Electromagnetic Spectrum

the rate of transfer of energy across a given surface

• Infrared

• Energy flux

• Radio waves

• Wein's Law

States that the total energy radiated per unit surface area of a black body across all wavelengths per unit time (also known as the black-body radiant emittance) is directly proportional to the fourth power of the black body's thermodynamic temperature

• Wien's Law

• Stefan-Boltzmann Law

• Universal Law of Gravitation

• Blackbody law

states that the black-body radiation curve for different temperatures will peak at different wavelengths that are inversely proportional to the temperature.

• Stefan-Boltzmann law

• Wein's law

• Universal law of Gravitation

• Kepler's 3rd law

If an object has a luminosity of 7.5, this means...

• the object is 7.5 times brighter than the sun.
• the object is 7.5% brighter than the sun
• the object has a redder color than the sun.
• the object is 7.5 times smaller than the sun.

Absolute magnitude is defined as...

• the brightness of an object in space, measured as if you’re 10 parsecs away from the object.
• Total energy emitted by a space object per unit time.
• the brightness of an object in space, as it appears from Earth
• the color of an object in space, described on a number scale.

The effective temperature of a star is related to its...

• solar system
• luminosity
• absolute magnitude
• color

Spectral class is a way of describing a star’s

• size
• luminosity
• age
• color

The color index of a star provides information about that star’s

• age
• luminosity
• absolute magnitude
• temperature