Deck 23: Thermal Radiation

Question 1

By definition this ideal object absorbs all energy that hits it:

A) Blackbody
B) Thermal Body
C) Nuclear Body
D) Chemical Body

Answer 1

Blackbody

Question 2

The total light output of an object is called ____.

A) Wien's law
B) Stefan's Law
C) Blackbody Law
D) luminosity

Answer 2

luminosity

Question 3

The temperature of a body and its color (peak wavelength) is called _____.

A) Stefan's Boltzman Law
B) Wien's law
C) Blackbody law
D) Planck's law

Answer 3

Wien's law

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

A) hotter than the Sun.
B) cooler than the Sun.
C) the same temperature as the Sun.
D) hotter or cooler, depending on its color.

Question 5

_________ is the vibration of the atoms.

Question 6

_________ is the temperature scale that starts at zero.

Question 7

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

Question 8

The hotter the body, the longer waves it emits.