Radiation and Spectroscopy Test Review Flashcards
The number of waves passing the observer per second is:
The frequency in Hertz
Both sound waves and electromagnetic radiation:
Transfer energy
What does the phenomenon of diffraction demonstrate?
The wave nature of light
What does the phenomenon of interference demonstrate?
The particle nature of the photon
Which of these is constant for ALL types of electromagnetic radiation in a vacuum?
Velocity
Electromagnetic radiation:
Can behave both as a wave and as a particle
Of all the forms of electromagnetic radiation, the one with the lowest frequency is:
Radio Waves
The two forms of electromagnetic radiation that penetrate the atmosphere best are:
Visible and Radio Waves
Colors appear different to us because of their photons’ different:
Frequencies
Which type of radiation can be observed well from Earth’s surface?
Visible
The wavelength at which a blackbody radiates most depends on its:
Temperature
Star A and Star B have the same temperature, but Star A is 5 times bigger than Star B. Which statement below is correct?
Star A and B have the same color, but Star A is brighter.
What is spectroscopy?
An analysis of the way in which atoms absorb and emit light.
Typical stellar spectra appear as:
A rainbow, but with some dark lines mixed in
The three laws dealing with the creation of various spectra are due to:
Kirchhoff
The element first found in the Sun’s spectrum, then on Earth 30 years later, is:
Helium
An incandescent light (glowing tungsten filament) produces:
A continuous spectrum, with the peak giving the temperature of the filament.
An emission spectrum can be used to identify a(n):
Atom
In Bohr’s model of the atom, electrons:
only make transitions between orbitals of specific energies.
A heavy neutral atom, such as iron, produces many spectral lines compared to light elements like hydrogen and helium. Why?
Because of the larger number of electrons and corresponding energy levels, more transitions are possible
Why are molecular lines more complex than elemental spectral lines?
Molecules can vibrate and rotate as well.
Spectral lines are often referred to as the stars’ “fingerprints” because:
All of these are correct
The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
This is an example of the Doppler effect.
The broadening of spectral lines can be caused by:
Density of the hot medium; thermal motion of the hot atoms; rotation of the star.
