Question 1

By definition this ideal object absorbs all energy that hits it:&#10;A) Blackbody&#10;B) Thermal Body&#10;C) Nuclear Body&#10;D) Chemical Body

Accepted Answer

A blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.

Question 2

The total light output of an object is called ____.&#10;A) Wien's law&#10;B) Stefan's Law&#10;C) Blackbody Law&#10;D) luminosity

Accepted Answer

Luminosity refers to the total amount of light that an object emits or radiates into space. It is a measure of the electromagnetic energy output of a celestial body, like a star, galaxy, or planet.

Question 3

The temperature of a body and its color (peak wavelength) is called _____.&#10;A) Stefan's Boltzman Law&#10;B) Wien's law&#10;C) Blackbody law&#10;D) Planck's law

Accepted Answer

Wien's law describes the relationship between the temperature of a body and the peak wavelength of its emitted radiation, indicating that as the temperature increases, the peak wavelength decreases and shifts towards the blue end of the spectrum.

Question 4

The Sun radiates most strongly at a wavelength of about 550 nm. A star that radiated most strongly at 400 nm would be&#10;A) hotter than the Sun.&#10;B) cooler than the Sun.&#10;C) the same temperature as the Sun.&#10;D) hotter or cooler, depending on its color.

Accepted Answer

The wavelength at which a star radiates most strongly is inversely related to its temperature according to Wien's displacement law. A shorter wavelength (400 nm compared to the Sun's 550 nm) indicates a higher temperature, so the star would be hotter than the Sun.

Question 5

_________ is the vibration of the atoms.

Accepted Answer

The answer of _________ is the vibration of the atoms....

Question 6

_________ is the temperature scale that starts at zero.

Accepted Answer

The answer of _________ is the temperature scale that starts...

Question 7

The luminosity of a hot body rises rapidly as its temperature increases.

Accepted Answer

The luminosity of a hot body increases rapidly with temperature due to the Stefan-Boltzmann law, which states that the total energy radiated per unit surface area of a black body is directly proportional to the fourth power of the black body's temperature.

Question 8

The hotter the body, the longer waves it emits.

Accepted Answer

The hotter the body, the shorter the wavelength of the radiation it emits, according to Wien's displacement law.

Deck 23: Thermal Radiation