Multiple Choice Questions

An electron volt is?
  • emits a photon of a specific frequency
  • Have wavelengths that are longer than normal
  • an absorption line spectrum
  • an amount of energy much smaller than a J
What is the difference between power and energy?
  • a hot object emits more total radiation per unit surface area than a cool object
  • Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time
  • Radiation with a spectrum that depends only on the emitting objects temperature
  • X rays travel through space faster than radio waves
Thermal radiation is defined as?
  • a hot object emits more total radiation per unit surface area than a cool object
  • Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time
  • Radiation with a spectrum that depends only on the emitting objects temperature
  • an amount of energy much smaller than a J
how are wavelength, frequency, and energy related for photons of light?
  • The wavelength of spectral lines in the star's spectrum
  • X rays travel through space faster than radio waves
  • Longer wavelength means lower frequency and lower energy
  • Have wavelengths that are longer than normal
From shortest to longest wavelength what is the correct order of the different categories of electromagnetic radiation?
  • gamma rays, X rays, ultraviolet, visible light, infrared, radio
  • The wavelength of spectral lines in the star's spectrum
  • the line in the faster rotating star is broader
  • Have wavelengths that are longer than normal
Suppose you want to know the chemical composition of a distant star. Which piece of info is most useful?
  • The wavelength of spectral lines in the star's spectrum
  • Have wavelengths that are longer than normal
  • its wavelength of energy
  • Longer wavelength means lower frequency and lower energy
When white light passes through a cool cloud of gas, we see a(n)?
  • emits a photon of a specific frequency
  • an emission line spectrum
  • an absorption line spectrum
  • a shorter average wavelength
The spectra of most galaxies show redshifts. This means that their spectral line....
  • its wavelength of energy
  • Longer wavelength means lower frequency and lower energy
  • The wavelength of spectral lines in the star's spectrum
  • Have wavelengths that are longer than normal
The frequency of a wave is?
  • an absorption line spectrum
  • an amount of energy much smaller than a J
  • all of the above
  • a shorter average wavelength
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?
  • the line in the faster rotating star is broader
  • an emission line spectrum
  • The star is movie towards us
  • a shorter average wavelength
Suppose you know the frequency of a photon and the speed of light. What else can you determine about the photon?
  • emits a photon of a specific frequency
  • The wavelength of spectral lines in the star's spectrum
  • Have wavelengths that are longer than normal
  • its wavelength of energy
When considering light as mad up of individual "pieces," each characterized by a particular amount of energy, the pieces are called what?
  • Photons
  • infrared
  • emits a photon of a specific frequency
  • an absorption line spectrum
what about thermal radiation is always true.
  • X rays travel through space faster than radio waves
  • Power is the rate at which energy is used, so its units are a unit of energy divided by a unit of time
  • a hot object emits more total radiation per unit surface area than a cool object
  • Radiation with a spectrum that depends only on the emitting objects temperature
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?
  • The star is movie towards us
  • an absorption line spectrum
  • an emission line spectrum
  • its wavelength of energy
0 h : 0 m : 1 s

Multiple Choice Questions
Answered Not Answered Not Visited Correct : 0 Incorrect : 0