a hot object emits more total radiation per unit surface area than a cool object
0%
Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time
0%
Radiation with a spectrum that depends only on the emitting objects temperature
0%
X rays travel through space faster than radio waves
Q.3.
Thermal radiation is defined as?
0%
a hot object emits more total radiation per unit surface area than a cool object
0%
Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time
0%
Radiation with a spectrum that depends only on the emitting objects temperature
0%
an amount of energy much smaller than a J
Q.4.
how are wavelength, frequency, and energy related for photons of light?
0%
The wavelength of spectral lines in the star's spectrum
0%
X rays travel through space faster than radio waves
0%
Longer wavelength means lower frequency and lower energy
0%
Have wavelengths that are longer than normal
Q.5.
From shortest to longest wavelength what is the correct order of the different categories of electromagnetic radiation?
0%
gamma rays, X rays, ultraviolet, visible light, infrared, radio
0%
The wavelength of spectral lines in the star's spectrum
0%
the line in the faster rotating star is broader
0%
Have wavelengths that are longer than normal
Q.6.
Suppose you want to know the chemical composition of a distant star. Which piece of info is most useful?
0%
The wavelength of spectral lines in the star's spectrum
0%
Have wavelengths that are longer than normal
0%
its wavelength of energy
0%
Longer wavelength means lower frequency and lower energy
Q.7.
When white light passes through a cool cloud of gas, we see a(n)?
0%
emits a photon of a specific frequency
0%
an emission line spectrum
0%
an absorption line spectrum
0%
a shorter average wavelength
Q.8.
The spectra of most galaxies show redshifts. This means that their spectral line....
0%
its wavelength of energy
0%
Longer wavelength means lower frequency and lower energy
0%
The wavelength of spectral lines in the star's spectrum
0%
Have wavelengths that are longer than normal
Q.9.
The frequency of a wave is?
0%
an absorption line spectrum
0%
an amount of energy much smaller than a J
0%
all of the above
0%
a shorter average wavelength
Q.10.
Laboratory measurements show hydrogen produces spectral line at a wavelength of 486.1 nanometers (nm). A particular stars spectrum shows the same hydrogen line at a wavelength of 486.0 nm. What can we conclude?
0%
the line in the faster rotating star is broader
0%
an emission line spectrum
0%
The star is movie towards us
0%
a shorter average wavelength
Q.11.
Suppose you know the frequency of a photon and the speed of light. What else can you determine about the photon?
0%
emits a photon of a specific frequency
0%
The wavelength of spectral lines in the star's spectrum
0%
Have wavelengths that are longer than normal
0%
its wavelength of energy
Q.12.
When considering light as mad up of individual "pieces," each characterized by a particular amount of energy, the pieces are called what?
0%
Photons
0%
infrared
0%
emits a photon of a specific frequency
0%
an absorption line spectrum
Q.13.
what about thermal radiation is always true.
0%
X rays travel through space faster than radio waves
0%
Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time
0%
a hot object emits more total radiation per unit surface area than a cool object
0%
Radiation with a spectrum that depends only on the emitting objects temperature
Q.14.
If you heat a gas so that collisions are continually bumping electrons to higher energy levels, when the electrons fall back to lower energy levels the gas produces?
0%
The star is movie towards us
0%
an absorption line spectrum
0%
an emission line spectrum
0%
its wavelength of energy
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